A. is able to    
B. could  
C. was able to    
D. can

A. had he turned up    
B. did he turn up    
C. he turned up    
D. he had turned up

A. taught        
B. has taught        
C. had taught        
D. has been teaching

A. dialed; no such man as        
B. are dialing, no such a man as
C. dialed; no such a man as      
D. are dialing, no such man as

1. I ___________(认出) Tom the moment I came across him in the street last week,
    though we hadn't met each other for years.
2. What he said __________(证明是) to be true .
3. Tomorrow, my mother will take me to the hospital and have my body e_________.
4. How much do you c_______ for repairing my CD player?
5. She is c_________, because she has got an "A" in the exam.
6. Suddenly it started to rain. They had to take _________(庇护) under a big tree.
7. Time is p__________ to us. We must make the best of it. .
8. It seems that living green is   _____  (惊人地)easy and affordable( 负担得起的). A
    small step makes a big difference.
9. What are the________ (功能)of minerals in our body.
10. As we all know, the majority of the s________ of the earth is covered by water.

A. Though he was ill, went
B. He was ill, go
C. Having been ill, should go
D. Having been ill, went

A. has been
B. had been
C. was
D. be

A. had lost
B. have lost
C. were losing
D. lost

A. Do you sleep
B. Were you sleeping
C. Did you sleep
D. Had you slept

A. tells
B. tell
C. telling
D. told