My newly- purchased bag is nowhere to be found.____

1Days later, my brother called to say he was all right, but _______say where he was.
A.mustn't
B.shouldn't
C.wouldn't
D.mightn't
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2Some “healthy” habits, such as shower every day and sitting on the loo, _____ be bad for you.
A.can
B.should
C.must
D.shall
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3In crowded places like airports and railway stations, you _____ take care of your luggage.
A.can
B.may
C.must
D.will
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4I am fond of my sister but she has one serious shortcoming. She _________ be really stubborn.
A.can
B.may
C.must
D.shall
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5I _____ have watched that movie --- it'll give me horrible dreams.
A.couldn't
B.needn't
C.shouldn't
D.mustn't
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6Tommy, you _______ be hooked on the Internet all day. You may fall behind others in study.
A.mustn't
B.shan't
C.can't
D.needn't
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7That truck nearly hit me; I ______
A.might be killed
B.may been killed
C.may be killed
D.might have been killed
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8As everyone knows, rubbish ______everywhere.
A.need be thrown
B.mustn't be thrown
C.can't throw
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9________anyone phone, tell them I'm in conference.
A.Would
B.Shall
C.Could
D.Should
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10I______ thank you too much for all your help to my son while we were away from home.
A.won't
B.can't
C.can
D.will
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My newly- purchased bag is nowhere to be found._______ I have left it on the bus?