Cho hình chóp tam giác đều  có các cạnh bên  vuông góc với nhau từng đôi một. Biết thể tích của khối chóp bằng . Tính bán kính  của mặt cầu nội tiếp của hình chóp .

Tính thể tích của khối hình thu được sau khi quay nửa đường tròn tâm O đường kính AB quanh trục AB, biết ?  

Thể tích khối cầu bán kính  bằng  

Cho ba hình cầu tiếp xúc ngoài nhau từng đôi một và cùng tiếp xúc với một mặt phẳng. Các tiếp điểm của các hình cầu trên mặt phẳng lập thành tam giác có các cạnh bằng ,  và . Tích bán kính của ba hình cầu trên là:        

Hai quả cầu rắn làm bằng cùng một kim loại có trọng lượng  và. Biết đường kính của quả cầu nhỏ hơn là Bán kính của quả cầu lớn hơn bằng:         

Cho hình chóp tam giác đều  có các cạnh bên  vuông góc với nhau từng đôi một. Biết thể tích của khối chóp bằng . Tính bán kính  của mặt cầu nội tiếp của hình chóp .

Thể tích của khối cầu có bán kính bằng:  

Có ba bồn giống hệt nhau chứa các quả cầu như hình dưới. Các quả cầu trong mỗi bồn có cùng kích thước và được đặt sát nhau. Nếu các bồn được đổ cho đầy nước, thì bồn nào sẽ chứa nhiều nước nhất?         

Trong không gian cho đường thẳng d và điểm , một điểm O thay đổi trên d. Gọi (S) là mặt cầu tâm O bán kính OA. Ta xét các mệnh đề sau: 1.       Mọi mặt phẳng qua d và A đề cắt (S) theo một đường tròn lớn. 2.       Tiếp diện của mặt cầu (S) tại A là một mặt phẳng cố định. 3.       Mặt cầu (S) luôn đi qua một đường tròn cố định. Trong các mệnh đề trên:  

Cho quả địa cầu có độ dài đường kinh tuyến Đông là (cm). Độ dài đường xích đạo là:  

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 30 to 34:

As a small-business owner, you can avoid many problems simply by improving communication in your office. By clarifying everyone’s expectations and roles, you'll help to (30) ________ greater trust and increased productivity among employees. Here are a few tips for doing so. Practice active listening. The art of active listening includes (31) ________ close attention to what another person is saying, then paraphrasing what you've heard and repeating it back. Concentrate (32)___the conversation at hand and avoid unwanted interruptions (cellphone calls, others walking into your office, etc.). Take note of how your own experience and values may color your perception. Pay attention to non-verbal cues. We don't communicate with words alone. Every conversation comes with a host of non-verbal cues-facial expressions, body language, etc. - that may (33) ________ contradict what we’re saying. Before addressing a staff member or (34) ________ a project conference, think carefully about your tone of voice, how you make eye contact, and what your body is "saying." Be consistent throughout. Be clear and to the point. Don't cloud instructions or requests with irrelevant details, such as problems with past projects or issues with long-departed personnel. State what you need and what you expect. Ask, "Does anyone have any questions?". Demonstrate that you prefer questions up-front as opposed to misinterpretation later on.

Question 32: 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 30 to 34:

As a small-business owner, you can avoid many problems simply by improving communication in your office. By clarifying everyone’s expectations and roles, you'll help to (30) ________ greater trust and increased productivity among employees. Here are a few tips for doing so. Practice active listening. The art of active listening includes (31) ________ close attention to what another person is saying, then paraphrasing what you've heard and repeating it back. Concentrate (32)___the conversation at hand and avoid unwanted interruptions (cellphone calls, others walking into your office, etc.). Take note of how your own experience and values may color your perception. Pay attention to non-verbal cues. We don't communicate with words alone. Every conversation comes with a host of non-verbal cues-facial expressions, body language, etc. - that may (33) ________ contradict what we’re saying. Before addressing a staff member or (34) ________ a project conference, think carefully about your tone of voice, how you make eye contact, and what your body is "saying." Be consistent throughout. Be clear and to the point. Don't cloud instructions or requests with irrelevant details, such as problems with past projects or issues with long-departed personnel. State what you need and what you expect. Ask, "Does anyone have any questions?". Demonstrate that you prefer questions up-front as opposed to misinterpretation later on.

Question 31:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 30 to 34:

As a small-business owner, you can avoid many problems simply by improving communication in your office. By clarifying everyone’s expectations and roles, you'll help to (30) ________ greater trust and increased productivity among employees. Here are a few tips for doing so. Practice active listening. The art of active listening includes (31) ________ close attention to what another person is saying, then paraphrasing what you've heard and repeating it back. Concentrate (32)___the conversation at hand and avoid unwanted interruptions (cellphone calls, others walking into your office, etc.). Take note of how your own experience and values may color your perception. Pay attention to non-verbal cues. We don't communicate with words alone. Every conversation comes with a host of non-verbal cues-facial expressions, body language, etc. - that may (33) ________ contradict what we’re saying. Before addressing a staff member or (34) ________ a project conference, think carefully about your tone of voice, how you make eye contact, and what your body is "saying." Be consistent throughout. Be clear and to the point. Don't cloud instructions or requests with irrelevant details, such as problems with past projects or issues with long-departed personnel. State what you need and what you expect. Ask, "Does anyone have any questions?". Demonstrate that you prefer questions up-front as opposed to misinterpretation later on.

Question 30:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 30 to 34:

As a small-business owner, you can avoid many problems simply by improving communication in your office. By clarifying everyone’s expectations and roles, you'll help to (30) ________ greater trust and increased productivity among employees. Here are a few tips for doing so. Practice active listening. The art of active listening includes (31) ________ close attention to what another person is saying, then paraphrasing what you've heard and repeating it back. Concentrate (32)___the conversation at hand and avoid unwanted interruptions (cellphone calls, others walking into your office, etc.). Take note of how your own experience and values may color your perception. Pay attention to non-verbal cues. We don't communicate with words alone. Every conversation comes with a host of non-verbal cues-facial expressions, body language, etc. - that may (33) ________ contradict what we’re saying. Before addressing a staff member or (34) ________ a project conference, think carefully about your tone of voice, how you make eye contact, and what your body is "saying." Be consistent throughout. Be clear and to the point. Don't cloud instructions or requests with irrelevant details, such as problems with past projects or issues with long-departed personnel. State what you need and what you expect. Ask, "Does anyone have any questions?". Demonstrate that you prefer questions up-front as opposed to misinterpretation later on.

Question 34:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 Question 31:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 Question 33:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 Question 32:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 Question 35:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 Question 34:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best option for each of the blanks.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes harm ecosystems. If there is too ___26__ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fire for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ___27___. Polluting the air, soil, and water can harm ecosystems. Building ___28___ on rivers for electric power and irrigation can harm ecosystems around the rivers. Bulldozing wetlands and cutting down ___29___ destroy ecosystems. Ecologists are working with companies and governments to find better ways of catching fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people ___30___ causing harm to ecosystems.   

Question 30: