A．do
B．to do
C．doing
D．did

A. Do eye exercise, for
B. Doing exercise, for
C. Do eye exercises, to
D. Doing eye exercises, to

A. turn              
B. not turn          
C. turning            
D. to turn

A. collect        
B. to collect        
C. collecting          
D. for collecting

A. speak
B. speaking
C. to speak
D. speaks

A.watch  
B.watched  
C.watching  
D.watches

1. The dolphin is too old to jump as _       _(high) as he used to.
2. In general, some animals are not so            ( clever) as the monkeys.
3. He was not used to         ( eat)  the Western-style food when he got to England for the first time.
4. I used to______(swim)  in the river when l was very young
5. It's good for you to stop          (smoke).
6. He was the only person in the room who had been drinking_     ___(heavy).
7. My mother doesn't make me____(play) with the lazy boys.
8. I saw a man in black____   (walk) into the Bank of China.
9. We used to hate        (remember) whose longer English words.
10. I'm not still used to____(write) the diaries.

A. buy    
B. bought    
C. buying    
D. to buy

A. write              
B. wrote    
C. writing            
D. written

A. standing                      
B. cleaning  
C. getting                        
D. staying