Choose the correct answer to fill in the blanks. 
Nobody yet knew what ________ to cause the dam to burst, but the residents of the area organized quickly to protect life and property against the rising of floods.
A.happens  
B.had happened 
C.happen  
D.did it happen

_________hard he tried, he couldn't open the door.      
A.Therefore                   
B.However                            
C.Although                            
D.Despite

Peter: “I’m having some friends over for lunch this Saturday. Would you like to join us?” Mary: “_________________”
A.Can I take a rain check?  
B.Come on. It’s your turn.
C.Thanks, but I mustn’t.
D.As a matter of fact, I do

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges.
Ensoleill and Sunny are talking about Ted’s accident last week. - Ensoleill: “A motor bike knocked Ted down”. - Sunny: “ _________.”
A.How terrific!
B.What it is now?
C.Poor Ted!
D.What a motor bike!

Exercise 3. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase for each of the numbered blanks from 11 to 15.
TREES FOR LIFE
Trees are among the biggest and longest-living things on Earth, some dating back longer than the oldest buildings. But (11)_______ being nice to look at, trees also play an important role in improving the quality of our lives.
On a world-wide (12)_______, forests help to slow down the effects of global warming by using up the gas known as carbon dioxide and giving (13)_______  the oxygen we need to breathe. At local neighborhood level, trees also (14)_______  important environment benefits. They offer shade and shelter, which in (15)_______  reduces the amount of energy needed to heat and cool nearby buildings; at the same time, they also remove other impurities from the air we breathe.
(2) 
A.range                      
B.size                         
C.scale                       
D.area

A.persuade
B.polite
C.publish
D.supply

Choose A, B, C or D to complete this passage:
These days it is impossible to open a newspaper (1)_____ reading about the damage we are doing to the environment. The Earth is being threatened (2)______ the future looks bad. (3)______ can each of us do?
We cannot clean (4)______ our polluted rivers and seas overnight. Nor can we stop the (5)______ of plants and animals. But we can stop adding to the problem (6)______ scientists look for answers.
It may not be easy to change your lifestyle (7)_______ but some steps are easy to take: cut down the amount of driving you do, or use as little plastic as possible. It is also easy to save (8)_____ , which also (9)_______ household bills. We must all make a personal decision to work for the future of our planet if we want to ensure a better world (10)_______ our grandchildren.
___(4)
A.to
B.up
C.on
D.in

Speaking English fluently is difficult
A.
B.
C.
D.

The flight to Ho Chi Minh City lasted one hour and a half.”
A.It took one hour and a half fly to Ho Chi Minh City.
B.It took one hour and a half flying to Ho Chi Minh City.
C.It took one hour and a half to have flied to Ho Chi Minh City.
D.It took one hour and a half to fly to Ho Chi Minh City.

According to the text, students in the USA _______.
A.are made to take primary and secondary education in the country.
B. are not necessarily take primary and secondary education in the country.
C.spend less than 12 years for primary and secondary education.
D.needn't take primary and secondary education.