—I‘ve be en told to pay the rent.—But it‘s already been paid.It______by someone else（）
A. must be
B. may be
C. must be paid
D. must have been paid
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Jimmy‘s mother went out because________（）
A. she waited for hours
B. nobody called
C. she had to buy some bread
D. she had to buy some milk
—I started to study，but then a friend called.—That‘s no excuse________（）
A. for not studying
B. not for studying
C. not studying
D. not to studying
Why do you insist on________（）
A. this to be done
B. this done
C. this being done
D. this is done
—Did we have to wait for Tom —Well，_______very angry if we hadn‘t waited for him（）
A. he‘d have been
B. he were
C. he had been
D. he must be
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