Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

My mother told me to ______ for an electrician when her fan was out of order.

A. turn

B. rent

C. send

D. write

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

“Buy me a newspaper on your way back, ______?”

A. will you

B. can’t you

C. do you

D. don’t you

Hiđro hoá hợp chất hữu cơ X được isopentan. X tham gia phản ứng trùng hợp được một loại cao su. Công thức cấu tạo thu gọn của X là

A.  C H 3 - C H 2 - C ≡ C H

B.  C H 3 - C C H 3 | = C = C H 2

C.  C H 2 = C C H 3 | - C H = C H 2

D.  C H 2 = C H - C H = C H 2

Trong không gian Oxyz, cho mặt cầu (S):  x 2 + y 2 + z 2 - 8 x + 4 y + 2 z - 4 = 0 có bán kính R là

A. R=5

B. R=2

C. R=25

D.  5

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.

Bill was about average (A) in performance in (B) comparison with other students (C) in his (D) class.

A. about average

B. in

C. with other students

D. his

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.

Even though (A) the extremely (B) bad weather in the mountains, the climbers decided not to cancel (C) their climb (D).

A. even though

B. extremely

C. not to cancel

D. climb

Trong không gian Oxyz, cho mặt cầu ( S ) :   ( x + 1 ) 2 + ( y - 2 ) 2 + ( z - 1 ) 2 = 9 . Tìm tọa độ tâm I và bán kính R của mặt cầu (S).

A. I(-1;2;1), R=9

B. I(1;-2;-1), R=9

C. I(1;-2;-1), R=3

D. I(-1;2;1), R=3

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

I don’t know what they are going to ask in the job interview. I’ll just play it by ear. 

A. plan well in advance 

B. be careful about it 

C. listen to others saying 

D. do not plan beforehand 

Read the following passage and mark the letter A,B,C or D on your answer sheet to indicate the correct answer to each of the questions from 55 to 64

An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.

Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities.

However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm

For which of the following reasons can natural pollutants play an important role in controlling air pollution?

A. They are less harmful to living beings than other pollutants.

B. They have existed since the Earth developed

C. They occur in greater quantities than other pollutants.

D. They function as part of a purification process.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 30 to 34.

        A tropical cyclone is a violent low pressure storm that usually occurs over warm oceans of over 80°F or 27°C. It winds counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere as it is described for the term, cyclone itself. This powerful storm is fueled by the heat energy that is released when water vapor condenses at high altitudes, the heat ultimately derived from the Sun.

        The center of a tropical cyclone, called the eye, is relatively calm and warm. This eye, which is roughly 20 to 30 miles wide, is clear, mainly because of subsiding air within it. The ring of clouds around the eye is the eyewall, where clouds reach highest and precipitation is heaviest. The strong wind, gusting up to 360 kilometers per hour, occurs when a tropical cyclone’s eyewall passes over land.

        There are various names for a tropical cyclone depending on its location and strength. In Asia, a tropical cyclone is named according to its strength. The strongest is a typhoon; its winds move at more than 117 kilometers per hour. In India, it is called a cyclone. Over the North Atlantic and in the South Pacific, they call it a hurricane.

        On average, there are about 100 tropical cyclones worldwide each year. A tropical cyclone peaks in late summer when the difference between temperature in the air and sea surface is the greatest. However, it has its own seasonal patterns. May is the least active month, while September is the most active.

        The destruction associated with a tropical cyclone results not only from the force of the wind, but also from the storm surge and the waves it generates. It is born and sustained over large bodies of warm water, and loses its strength over inland regions that are comparatively safe from receiving strong winds. Although the tract of a tropical cyclone is very erratic, the Weather Service can still issue timely warnings to the public if a tropical cyclone is approaching densely populated areas. If people ever experience a cyclone, they would know how strong it could be.

What is the main idea of the passage?

A. The tropical cyclone is the most powerful force on the earth. 

B. The tropical cyclone can cause flooding and damage to structures. 

C. A tropical cyclone forms over the oceans and has great power. 

D. The tropical cyclone is called by different names around the world.