单项选择题

Please pay attention ______ what I say.

A．to
B．at
C．of
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单项选择题
Be careful ______ your health.
A．except
B．of
C．to
单项选择题
The students ______ the History Museum if it ______ fine tomorrow.
A．will visit, is
B．will visit, will be
C．would visit, was
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