---Vangul’s paintings are very abstract（抽象的）. Can you tell what this painting is about?
--- Oh, it’s hard to say. I think it ______ be a man riding a horse.
A. might B. can C. must D. should
---Must I return the magazine to you right now, Sandy?
---No, you _____.You may keep it until next Wednesday.
A. needn’t B. can’t C. must D. may
--What would you send to your sister as the Christmas gift?
--I haven't decided yet．I _________ send her a hand bag．
A. shall B. may C. must
- 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
