单项选择题

We should be able to do the job for you quickly,（）you give us all the necessary informarion.

A．as if
B．provided that
C．in case
D．so that

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单项选择题

Without the sun's light（）the earth's surface, it would be so cold that life could not exist on the earth.

A．warms
B．warmed
C．warming
D．to warm

单项选择题

Once environmental damage（）, it takes many years for the system to recover.

A．had done
B．is done
C．is to do
D．does

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