Choose the best answer for the following sentence:
The little girl asked what _________________ to her friend.
A. has happened                                                         
B. happened 
C. had happened                              
D. would have been happened

Choose the best answer for the following sentence:
If people paid a little more attention to the environment, the Earth ____________ greener.  
A. had been                    
B. would be                     
C. would have been                     
D. will be

Choose the best answer for the following sentence:
A clever dog can recognize its owner's ____________ among hundreds of strangers'. 
A. sound                  
B. whistles                   
C. noise                     
D. movement

Choose the best answer for the following sentence:
Would you mind not __________________ the radio until I’'ve finished with this phone call? 
A. turning on                
B. being turned on  
C. to turn on              
D. to be turned on

Choose the best answer for the following sentence:
It gets ________________ when the winter is coming. 
A. cold and cold                          
B. the coldest and coldest
C. colder and colder                     
D. more and more cold

Choose the best answer for the following sentence:
When I arrived late, my boss was very angry ___________ me.
A. with 
B. for
C. to 
D. of

Choose the best answer for the following sentence:
The ________________ trend in the graph is the improvement in people's living standard between 1990 and 2000.
A. second biggest
B. second bigger
C. twice big
D. twice bigger

Choose the best answer for the following sentence:
Excuse me, _________ I borrow your newspaper if you are not reading it? 
A. must   
B. might  
C. can 
D. should

Choose the best answer for the following sentence:
There was a huge decline ___________ the number of panda.
A. in
B. for
C. of
D. out

Choose the best answer for the following sentence:
“Have you seen Kate?”
“No, but she _________ be at her desk.” 
A. may               
B. ought             
C. would                
D. can