Cho tam giác $ABC$ có ba cạnh $BC$, $CA$, $AB$ và ba góc $A$, $B$, $C$ cùng theo thứ tự đó lập thành các cấp số cộng. Tính $S=\tan \dfrac{3A}{4} \tan\dfrac{3B}{4} \tan\dfrac{3C}{4}$.

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

Traditionally, Americans and Asians have very(20) _____ideas about love and marriage. Americans believe in ‘romantic’ marriage – a boy and a girl are (21)____ to each other, fall in love, and decide to marry each other. Asians, on the other hand, believe in contractual marriage – the parents of the bride and the groom decide on the marriage; and love – if it ever develops – is supposed to follow(22) _____, not precede it. To show the differences, a(23) ______was conducted among American, Chinese and Indian students to determine their attitudes (24)_____ love and marriage.

Question 21:  

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 blanks:

Teaching English as a foreign language can be a great way to travel the world and earn money at the same time. However, some graduates actually like the idea of (4) ............... a career in teaching English long-term, and there are numerous courses at various (5) ............... of teaching, from the fast-track TEFL to a diploma or masters. To find the right course a good place to start is TEFL.com – an Internet site with lots of relevant information and helpful advice, including a comprehensive list of institutions in the UK offering TEFL courses. The site also offers a job search facility to assist qualified students (6) ............... finding work.  When deciding which course to take, the best bet is to look at what your needs are. If you want a career in teaching English then definitely find one designed for that (7) ..........., like an MA or diploma; but if you want to travel around the world, then do a shorter course which will supply you with teaching skills. Some countries, like Japan, will employ people without a teaching qualification as (8) ............. as the teacher is a native speaker of English. However, most countries do now expect a qualification.

Question 6:

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 blanks:

Teaching English as a foreign language can be a great way to travel the world and earn money at the same time. However, some graduates actually like the idea of (4) ............... a career in teaching English long-term, and there are numerous courses at various (5) ............... of teaching, from the fast-track TEFL to a diploma or masters. To find the right course a good place to start is TEFL.com – an Internet site with lots of relevant information and helpful advice, including a comprehensive list of institutions in the UK offering TEFL courses. The site also offers a job search facility to assist qualified students (6) ............... finding work.  When deciding which course to take, the best bet is to look at what your needs are. If you want a career in teaching English then definitely find one designed for that (7) ..........., like an MA or diploma; but if you want to travel around the world, then do a shorter course which will supply you with teaching skills. Some countries, like Japan, will employ people without a teaching qualification as (8) ............. as the teacher is a native speaker of English. However, most countries do now expect a qualification.

 Question 7:

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 blanks:

Teaching English as a foreign language can be a great way to travel the world and earn money at the same time. However, some graduates actually like the idea of (4) ............... a career in teaching English long-term, and there are numerous courses at various (5) ............... of teaching, from the fast-track TEFL to a diploma or masters. To find the right course a good place to start is TEFL.com – an Internet site with lots of relevant information and helpful advice, including a comprehensive list of institutions in the UK offering TEFL courses. The site also offers a job search facility to assist qualified students (6) ............... finding work.  When deciding which course to take, the best bet is to look at what your needs are. If you want a career in teaching English then definitely find one designed for that (7) ..........., like an MA or diploma; but if you want to travel around the world, then do a shorter course which will supply you with teaching skills. Some countries, like Japan, will employ people without a teaching qualification as (8) ............. as the teacher is a native speaker of English. However, most countries do now expect a qualification.

Question 8:  

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:

Rural America is diverse in many ways. As we have seen, no one industry dominates the rural economy no single pattern of population decline or growth exists for all rural areas, and no statement about improvements and gaps in well-being holds true for all rural people. Many of these differences are regional in nature. That is, rural areas within a particular geographic region of the country often tend to be similar (24) _______ each other and different from areas in another region. Some industries, for example, are (25) _______ with different regions-logging and sawmills in the Pacific Northwest and New England, manufacturing in the Southeast and Midwest, and farming in the Great Plains. Persistent poverty also has a regional pattern, concentrated primarily in the Southeast. Other differences follow no regional pattern. Areas that rely heavily on the services industry are located throughout rural America, as are rural areas that have little access to advanced telecommunications services. Many of these differences, regional and non-regional are the result of a (26) _______ of factors including the availability of natural (27) ______; distance from and access to major metropolitan areas and the information and services found there; transportation and shipping facilities; political history and structure; and the racial, ethnic, and (28) ______ makeup of the population.

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 24 to 28:

Rural America is diverse in many ways. As we have seen, no one industry dominates the rural economy no single pattern of population decline or growth exists for all rural areas, and no statement about improvements and gaps in well-being holds true for all rural people. Many of these differences are regional in nature. That is, rural areas within a particular geographic region of the country often tend to be similar (24) _______ each other and different from areas in another region. Some industries, for example, are (25) _______ with different regions-logging and sawmills in the Pacific Northwest and New England, manufacturing in the Southeast and Midwest, and farming in the Great Plains. Persistent poverty also has a regional pattern, concentrated primarily in the Southeast. Other differences follow no regional pattern. Areas that rely heavily on the services industry are located throughout rural America, as are rural areas that have little access to advanced telecommunications services. Many of these differences, regional and non-regional are the result of a (26) _______ of factors including the availability of natural (27) ______; distance from and access to major metropolitan areas and the information and services found there; transportation and shipping facilities; political history and structure; and the racial, ethnic, and (28) ______ makeup of the population.

Question 25:       

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 15 to 19:

Fashions have always changed with time. No (15) ________ Roman girls worried about having the latest hairstyle and boys in Ancient Egypt wanted to have sandals that were cool and not the sensible ones their mothers preferred. Look (16) ________over recent times, there seem to be two main differences in the way fashions have changed compared to earlier time. Firstly, (17) ________ more people have a choice of clothes available to them. There are few places in the world where the trainers, the caps or the T-shirts of teenagers do not change from one year to the next. Secondly, styles are (18) ________within a much shorter time than they used to be. For instance, in the 1960s, (19) ________ had the same low waists and narrow skirts as forty years before. In the early years of the 21st century, the shops are full of long skirts and colored scarves like the ones in fashion only thirty years before. Soon, we will find that the really fashionable people look no different from the rest of us, because it is only ten years since their clothes were in fashion before!  

Question 19:

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 15 to 19:

Fashions have always changed with time. No (15) ________ Roman girls worried about having the latest hairstyle and boys in Ancient Egypt wanted to have sandals that were cool and not the sensible ones their mothers preferred. Look (16) ________over recent times, there seem to be two main differences in the way fashions have changed compared to earlier time. Firstly, (17) ________ more people have a choice of clothes available to them. There are few places in the world where the trainers, the caps or the T-shirts of teenagers do not change from one year to the next. Secondly, styles are (18) ________within a much shorter time than they used to be. For instance, in the 1960s, (19) ________ had the same low waists and narrow skirts as forty years before. In the early years of the 21st century, the shops are full of long skirts and colored scarves like the ones in fashion only thirty years before. Soon, we will find that the really fashionable people look no different from the rest of us, because it is only ten years since their clothes were in fashion before!  

Question 18:

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 15 to 19:

Fashions have always changed with time. No (15) ________ Roman girls worried about having the latest hairstyle and boys in Ancient Egypt wanted to have sandals that were cool and not the sensible ones their mothers preferred. Look (16) ________over recent times, there seem to be two main differences in the way fashions have changed compared to earlier time. Firstly, (17) ________ more people have a choice of clothes available to them. There are few places in the world where the trainers, the caps or the T-shirts of teenagers do not change from one year to the next. Secondly, styles are (18) ________within a much shorter time than they used to be. For instance, in the 1960s, (19) ________ had the same low waists and narrow skirts as forty years before. In the early years of the 21st century, the shops are full of long skirts and colored scarves like the ones in fashion only thirty years before. Soon, we will find that the really fashionable people look no different from the rest of us, because it is only ten years since their clothes were in fashion before!  

Question 17:

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 15 to 19:

Fashions have always changed with time. No (15) ________ Roman girls worried about having the latest hairstyle and boys in Ancient Egypt wanted to have sandals that were cool and not the sensible ones their mothers preferred. Look (16) ________over recent times, there seem to be two main differences in the way fashions have changed compared to earlier time. Firstly, (17) ________ more people have a choice of clothes available to them. There are few places in the world where the trainers, the caps or the T-shirts of teenagers do not change from one year to the next. Secondly, styles are (18) ________within a much shorter time than they used to be. For instance, in the 1960s, (19) ________ had the same low waists and narrow skirts as forty years before. In the early years of the 21st century, the shops are full of long skirts and colored scarves like the ones in fashion only thirty years before. Soon, we will find that the really fashionable people look no different from the rest of us, because it is only ten years since their clothes were in fashion before!  

Question 16: