Choose the best answer to complete the sentences. 
Humans _______ atmospheric carbon dioxide concentration by a third since the Industrial Revolution began.
A.increase          
B.have increased    
C.had increased       
D.were increasing

Have you got an idea ______ we should do to deal with this matter?
 
A.how                          
B.where                          
C.what                           
D.why

All passengers have to go through customs and immigration at the airport.
A.checkout counters
B.government department
C.taxes
D.visa office

The phrase “pick up” in paragraph 2 could best be replaced by which of the following?
A. attack  
B.lift 
C.transmit
D.perceive

________(49)
A. disease
B.illness
C.infection
D.ailment

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
"The blouse is too loose. You'd better ask your tailor to take it in."
A.Your tailor is asked to take your blouse in a little.
B.You'd better have the blouse taken in as it is too loose.
C.The blouse is lost as you didn't ask your tailor to take it in.
D.The blouse is little as you asked your tailor to take it in.

As a child, Madonna was probably
A.Happiest during her school days 
B.Lonely and without anyone to talk to 
C.Unhappy in New York 
D.Made stronger due to difficult events

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
There is reported to have been a record amount of pollution in many big cities in developing countries last year, _______?
A.isn’t there
B.isn’t it
C.haven’t there
D.hasn’t it

Read the following passage and choose the correct answer to each of the questions below.
            Since the early 1980s, we began to worry about the bad effects of environmental pollution. It is the result of industrialization and of the careless use of the natural resources. Avoiding pollution is not easy. Many people try not to inhale traffic fumes and keep away from chemical waste by wearing mask when they get out of their house. Actually, indoor pollution is becoming more and more serious. They have found that dishwasher, washing machines, air conditioners, freezers, and refrigerators emit some certain toxic chemicals into the air. We surely inhale these chemicals when doing housework. Using gas cookers and burning candles produce carbon monoxide.
            Therefore, before worrying about environmental pollution when going out, we should consider the problems of indoor pollution.
Inside house ________.
 
A.there is no pollution    
B.there are no toxic chemicals          
C.carbon monoxide is produced by gas cookers
D.there is no carbon monoxide

How can I remember these grammar rules?
— Well, try to do all the ....................exercises in this grammar hook.
A.study
B.working
C.learning
D.grammar