单项选择题

To keep ______ , we must do more outdoor exercises.

A．well
B．fine
C．fit
D．health
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单项选择题
The boy wanted to ride his bicycle in the street, but his mother told him ______.
A．not to
B．not to do
C．not do it
D．do not
单项选择题
I prefer black shirts ______ blue ones.
A．for
B．to
C．than
D．at
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