随堂演练
及时体验 巩固提升
Ⅰ.用适当的介词、副词填空
1．Good measures must be taken by the government to stop some companies ________ harming the environment.
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2．At that time life was not known ________ scientists.
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3．The origin of life ________ earth is a question that interests astronomers.
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4．At the sound of the gun, the birds flew ________ all directions.
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5．Though they were busy, they came to the meeting ________ time.
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6．Water and air are fundamental ________ life, if man wants to keep alive.
