单项选择题

We are using up our natural resources too quickly and at the same time we are ______ our environment with dangerous chemicals.

A．protecting
B．saving
C．polluting
D．fighting
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单项选择题
I will go back to my hometown as soon as I ______ my examinations.
A．will finish
B．finish
C．has finished
D．would finish
单项选择题
Hardly ______ when they ran toward it.
A．had the plane landed
B．did the plane land
C．the plane had landed
D．the plane landed
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