- Look! The man at the gate __be our headmaster. He is always standing there every morning.
- No, it ________ be him. He is holding a meeting in the office now.
A. must, can’t B. must, mustn’t C. can’t, can’t D. can’t, mustn’t
--There is somebody at the door．Who _________ it be? Is it the postman?
--No，it _________ be him．It's just seven o'clock． It's too early．
A. might；can't B. will；won't C. may；mustn't D. must；may not
--Listen! Kathy is playing the piano in the next room．
--It _________ be Kathy．She has gone to Hangzhou to visit the Cross-sea Bridge．
A. can't B. mustn't C. needn't D. shan't
--I didn't pass the English test．I think I have spent much time playing computer games recently．
--I agree．You ________ play like that any more．
A. needn't B. mustn't C. may not D. wouldn't
--Cathy’s parents have bought her a new house with a swimming pool．
--Really? It __________be very expensive．
A. can’t B. mustn’t C. must D. can
—Is Jessica giving us a speech this evening?
—No, it _________ be her．She _________ to Japan．
A. mustn’t；has gone B. mustn’t; has been
C. can’t; has gone D. can’t; has been
