Cha hiện nay 45 tuổi. Tuổi cha một năm trước gấp 4 lần tuổi con hiện nay. Hỏi sau bao nhiêu năm nữa tuổi cha sẽ gấp 3 lần tuổi con?

Điền số thích hợp vào chỗ chấm sau:
$12\frac{1}{{100}}\,\,kg = ....\,\,g$.

Điền số thích hợp vào chỗ chấm: $25\,k{m^2} = ......\,ha$

Tìm x biết: $\frac{4}{5} + x = 5\frac{{14}}{{15}}$.

Nếu đường kính một hình tròn tăng thêm 60% thì diện tích hình tròn đó tăng thêm bao nhiêu phần trăm?

Chữ số 3 của số thập phân 120,01035 thuộc hàng:

Cha hiện nay 45 tuổi. Tuổi cha một năm trước gấp 4 lần tuổi con hiện nay. Hỏi sau bao nhiêu năm nữa tuổi cha sẽ gấp 3 lần tuổi con?

Dựa vào biểu đồ và cho biết các bạn học sinh lớp 5A yêu thích môn thể thao nào ít nhất?

Tìm số tự nhiên x biết: $2,78\,\, \times \,\,x < \,2,779$.

Khi nhân một số với 436, bạn Nam đã đặt các tích riêng thẳng cột với nhau nên tìm được kết quả là 314,34. Hãy tìm tích đúng.

Tìm số tự nhiên x để biểu thức $P = 1990 + 720:(x - 6)$ có giá trị lớn nhất.

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 24 to 28:

The expression on your face can usually dramatically alter your feelings and perceptions, and it has been proved that deliberately smiling or frowning can create corresponding emotional responses. The idea was first (24) _______ by a French physiologist, Israel Waynbaum, in 1906. He believed that different facial (25) _______ affected the flow of blood to the brain, and that this could create positive or negative feelings. A happy smile or irrepressible laughter increased the blood flow and contributed to joyful feelings. But sad angry expressions decreased the flow of oxygen-carrying blood, and created a vicious (26) _______ of gloom and depression by effectively starving the brain of essential fuel. Psychologist Robert Zajone rediscovered this early subject, and suggests that the temperature of the brain could affect the production and synthesis of neurotransmitters, which definitely influence our moods and energy levels. He argues that an impaired blood flow could not only deprive the brain of oxygen, but also create further chemical imbalance (27) _______ inhibiting these vital hormonal messages. Zajone goes on to propose that our brains remember smiling associated with being happy, and that by deliberately smiling through your tears you can (28) _______ your brain to release uplifting neurotransmitters replacing a depression condition with a happier one. People suffering from psychosomatic ailment, depression and anxiety states could benefit from simply exercising their zygomatic muscles, which pull the corners of the mouth up and back to form a smile several times an hour.

Question 24:      

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 1 to 5:

In the past, it was common for three or more (1) ______ to live together in the same roof. Nowadays most elderly people live (2) ________their own. They generally stay in contact with their children or grandchildren but might live in the different part of the country. People also live together, often 20 years after they have (3) _________from their job. Modern American culture tends to value youth rather than age. This create an interesting challenge for older people and for the country. American families also have troubles. They are the divorce rate, the fact that working mothers might have (4)____________ time with their children, and the problems that parents and children sometimes misunderstand each other. (5)_________, family is still at the center of most people’s lives. 

Question 2:

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 1 to 5:

In the past, it was common for three or more (1) ______ to live together in the same roof. Nowadays most elderly people live (2) ________their own. They generally stay in contact with their children or grandchildren but might live in the different part of the country. People also live together, often 20 years after they have (3) _________from their job. Modern American culture tends to value youth rather than age. This create an interesting challenge for older people and for the country. American families also have troubles. They are the divorce rate, the fact that working mothers might have (4)____________ time with their children, and the problems that parents and children sometimes misunderstand each other. (5)_________, family is still at the center of most people’s lives. 

Question 1:

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:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

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:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

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:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

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:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

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:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

Question 35:

Read the following passage and choose 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:

Why is it that many teenagers have the energy to play computer games until late at night but can’t find the energy to get out of bed (26) __________ for school? According to a new report, today’s generation of children are in danger of getting so (27)________ sleep that they are putting their mental and physical health at (28)_________. Adults can easily survive on seven to eight hours sleep a night, (29)____________teenagers require nine or ten hours. According to medical experts, one in five youngsters (30)___________ anything between two and five hours sleep a night less than their parents did at their age.

Question 27:

Read the following passage and choose 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:

Why is it that many teenagers have the energy to play computer games until late at night but can’t find the energy to get out of bed (26) __________ for school? According to a new report, today’s generation of children are in danger of getting so (27)________ sleep that they are putting their mental and physical health at (28)_________. Adults can easily survive on seven to eight hours sleep a night, (29)____________teenagers require nine or ten hours. According to medical experts, one in five youngsters (30)___________ anything between two and five hours sleep a night less than their parents did at their age.

Question 26: