单项选择题

If these shoes are too big, buy a smaller ______.

A．set
B．pair
C．piece
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单项选择题
Now Helen works ______ than before.
A．more careful
B．more carefuller
C．more carefully
单项选择题
We are doing much better ______ English ______ our teachers help.
A．at, in
B．with, with
C．in, with
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