单项选择题

The smoke from that factory is ______ our air to a dangerous degree．

A．destroying
B．spoiling
C．polluting
D．damaging
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单项选择题
It’s high time ______ about the traffic problem．
A．something was done
B．everything is done
C．anything will be done
D．nothing to be done
单项选择题
“If John doesn’t come to work on time，he may be fired．”“Surely he isn’t so foolish ______ not to realize that．”
A．as
B．that
C．and
D．but
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