Choose the best answer for the following sentence:
The Amazon rainforest offers us such a biological _____________. 
A. variability              
B. diversity             
C. variation               
D. changeability

Choose the best answer for the following sentence:
The ______________ wanted to reduce the breadth of the games, with many events currently having small fields and weak competition. 
A. organize                      
B. organization                       
C. organizable                     
D. organizers

Choose the best answer for the following sentence:
Before the Prime Minister leaves Hanoi, he ________________ several talks. 
A. will have had                 
B. would have 
C. will be having                  
D. has

Choose the best answer for the following sentence:
There is _______________________ rainfall on the West Coast of the United States than on the East Coast. 
A. fewer                
B. little                  
C. less              
D. few

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