单项选择题

I hope all the precautions against air pollution, __ suggested by the local government, will be seriously considered here.

A．while
B．since
C．as
D．after
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If I __ you, I would go to look for him.
A． was
B．were
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Sound travels __ air.
A．through water faster and
B．where it is faster through water than through
C．faster through water than through
D．faster than through water and
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