We found all the rivers seriously to pollute.（)

Whether ways will be found to stop pollution or not is just which worries the public.

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All of the following contribute to the extinction of species EXCEPTA．hunting.B．pollution.C

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We must take precautious measures to prevent the river______.A．to be pollutedB．from pollut

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We have made up laws to protect the water from being polluted and the animals _____

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We found that the plane_____ when we got to the a

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We found it impossible __________ all the questi

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The pollution from the factories continues to ________ the river and also poses healt

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