单项选择题

Electricity is ______ great use in industry and everyday life.

A．for
B．of
C．no
D．with
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单项选择题
Our teacher insists that we ______ all our essays on alternate lines.
A．write
B．wrote
C．must write
D．ought write
单项选择题
Every policeman and fireman ______ on the alert.
A．have been
B．was
C．are
D．were
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