Students_______be careful when they do chemical experiments in the lab. [

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Students_______be careful when they do chemical experiments in the lab.      [     ]
A. can
B. must
C. need
D. may

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举一反三

—Is that your English teacher?
—No, it______be him.  He has gone abroad.      [     ]
A. mustn"t
B. may not
C. can"t
D. needn"t

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—Who"s that woman standing near the library? Is it your English teacher Miss Green?
—It ______. be Miss Green. She has gone abroad.      [     ]
A. must
B. can"t
C. may
D. shouldn"t

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It              be my cap.  Look, it has my name            _ it.       [     ]
A. must; on
B. can; in
C. must; in
D. can; on

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—_______I finish the work today?
—No, you needn"t.      [     ]
A. Must
B. May
C. Can
D. Need

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—Is Mr Zhou in the office?
—No, he_______ be there.  He has gone to Huanggang.    [     ]
A. mustn"t
B. needn"t
C. won"t
D. can"t

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