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(   ) 13. Mr. Bush is on time for everything. How       it be that he was late for the

opening ceremony?

A. can    B. should C. may    D. must

(   ) 12. ―Write to me when you get home.

       -__________

A. I must    B. I should 

C. I will    D. I can

(   ) 11. You can't imagine that a well-behaved gentleman      be so rude to a lady.

A. might    B. need     C. should    D. would

(   ) 10. Peter come with us tonight, but he isn't very sure yet.

A. must    B. can     C. may    D. will

(   ) 9. ―Is John coming by train？

       ―He should，but he      not.

A. must    B. can C. need    D. may

(   ) 8. You have already tried your best,so you      worry about the matter.

A. can't B. needn't C. mustn't D. couldn't

(   ) 7. ―Mum,can I wear my jeans to school？

      ―No,you      wear your school uniform. That's the school rule.

A. can    B. can't C. have to    D. may

(   ) 6. ―Must I wait for you here now?

一No，you __________. You may be back in half an hour.

A. don't have to B. mustn't

C. can't D. shouldn't

(   ) 5. This kind of food      cool,clean and dry according to the instruction.

A. should be carried    B. should be placed

C. must be put          D. must be kept

(   ) 4. ―Could I take this seat,sir?
       ―Yes,you      

A. could    B. must    C. need    D. can