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Finish your homework first, and you'll     surf the Internet for half an hour.A. can B. need C. be ...

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mustn’t    may not    couldn’t    needn’t  
Must ; needn’t    Can ; may   Can ;must    May ; mustn’t  
must    may    will    need  
can't  mustn't  must  needn't  
Of course    No way    Never mind    No doubt  
can    need  be able to    may  
can    need   be able to    may  
mustn't    need    must    can't  
must    have    had    had to  
can    need    be able to    may  
can    be able to    able    could  
can    need    be able to    may  
must    will    may    need  
must    may    will    need