- I didn't go to work yesterday afternoon because my car broke down.
　 - You ________ mine. I wasn't using it.
   A. might borrow                 B. could have borrowed
   C. can have borrowed         D. ought to borrow

 - I haven't seen Mr. White for weeks.
　 - What _____ to him?
   A. must have happened         B. may have happened
   C. can have happened         D. may happen

- I wonder if I ____ smoke here.
- No, you _______. Could you see the sign "No Smoking" there?
　 A. can, needn't B. shall, won’t C. must, can't D. may, mustn't

He was taken away by the police. He ___ for a robber.
A. must be mistaken B. was being mistaken

C. must mistake D. must have been mistaken

- I wonder why Mr. Wang didn't attend the lecture.

- He ____ another one.
A. could have B. must have C. might have had D. should have had

 English is a language that many people around the world ____ not speak perfectly but ___ at least understand.
   A. may, can         B. would, might         C. will, must         D. could, might

 Don't throw the bottles away. They ____ in the future.
   A. may need         B. are needed         C. can be needing         D. might be needed

 - You must phone us every week.
　 - Yes, I _____.
   A. must         B. have to         C. will         D. should

 - Did you visit the famous museum?
　 - No, we ___, but we spent too much time shopping.
   A. could have visited         B. must have visited
   C. can' t have visited         D. shouldn't have visited

 He was caught in the rain last night. That _____ his cold.
   A. can bring about                 B. ought to bring about
   C. should have brought about         D. may have brought about