---Who is the tallest boy?        ---It ______  be John. John is of medium height.
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A
must
B
needn’t
C
might
D
can’t
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As a student, you must ______ your teachers.
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A
show respect for
B
have respect to
C
show respects for
D
have respects to
She can hardly write her own name, ______?
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A
can she
B
can't she
C
need she
D
needn't she
Harry is feeling uncomfortable.He________too much at the party last night.
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A
could drink
B
should drink
C
would have drunk
D
must have drunk
Mary _______ her mother with the housework, but she didn’t.  
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A
must have helped
B
ought to have helped
C
must help
D
should help