“Can you answer this question, Sam?” “No, I ____.”
A. can't
B. needn't
C. mustn't
D. may not
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They usually have a meeting ____ Monday.
A. in
B. for
C. on
D. at
There ____ three balls in the box.
A. is
B. are
C. isn't
D. am
Kate was late for school yesterday, ____ she?
A. is
B. isn't
C. wasn't
D. was
Who is ____ , Tom, Mike or Jack?
A. careful
B. more careful
C. very careful
D. the most careful
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