Choose the best answer for the following sentence:
The room is too dirty. It ________________ now. 
A. should clean                        
B. should have cleaned
C. should be cleaning                              
D. should be being cleaned

Choose the best answer for the following sentence:
The people __________ the kidnapping have demanded a million dollars in small bills.  
A. responsible for                  
B. that responsible
C. which responsible for                   
D. who responsible for

Choose the best answer for the following sentence:
The porter and I looked at each other; ____________________ both smiled. 
A. I                
B. he                   
C. we                    
D. they

Choose the best answer for the following sentence:
I couldn’t cut the grass because the lawn mower ____________ a few dayspreviously.
A. broke down               
B. has been broken 
C. had broken down              
D. breaks down

Choose the best answer for the following sentence:
Since 1980, scientists all over the world ________________ a lot of things to fight against AIDS.
  
A. have done          
B. are doing             
C. did             
D. had done

Choose the best answer for the following sentence:
Learning the ___________ skills and techniques may not be as fun and engaging for the players. 
A. defensible                  
B. defender                  
C. defendant                 
D. defensive

Choose the best answer for the following sentence:
The young athlete was prevented from the match as the police found a ______________ of drugs hidden in his bags before the match began. 
A. quantity                    
B. quality                      
C. piece                 
D. thread

Choose the best answer for the following sentence:
I didn’t have much time, but I __________ visit a lot of places of interest in London.
A. can  
B. must
C. was able to
D. had to

Choose the best answer for the following sentence:
When they returned, my uncle _______________ by the news that the little old lady had made an appearance.
A. overwhelmed expectedly
B. expectedly was overwhelmed
C. was expectedly overwhelmed
D. expectedly overwhelmed

Choose the best answer for the following sentence:
Liz moved _____________ .
A. grace 
B. graceful 
C. gracefully 
D. on grace