Choose the best answer for the following sentence:My mother always moves my books around so I ___________ find them. 
A. can’t            
B. wasn’t able            
C. couldn’t            
D. may not

Choose the best answer for the following sentence:
I always feel safe and _________ in my family.
A. secret
B. confidential
C. secure
D. protective

Choose the best answer for the following sentence:
The Vietnam football team and the Thai team have always _____________ been in the recent Sea Games.
A. friends
B. participants
C. enemies
D. rivals

Choose the best answer for the following sentence:
If you are looking for volunteers, count me _________. 
A. off                      
B. in 
C. down     
D. out

Choose the best answer for the following sentence:
A woman who ________________ after other people's children is a nanny.
A.  looks  
B. is looking         
C.  looking  
D.  looked

Choose the best answer for the following sentence:
He was especially interested in such _____________ work, and had recently helped to organize the first Brazilian school for deaf-mutes at Rio de Janeiro.
A. humanitarian
B. human  
C. humanity              
D. humanistic

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