单项选择题

They swim every day ______ the holidays.

A．during
B．when
C．since
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单项选择题
—Jack, please ______ the radio, I want to sleep now. —I'm sorry, I will do it fight away.
A．turn on
B．turn off
C．turn up
单项选择题
There is ______ number of children playing on the playground.
A．/
B．a
C．the
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