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We all regard pollution as a matter to human beings.

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By cutting down trees, we _______the natural habitat of birds and animals.

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Because of people’s______ with the environment, many kinds of plants and animals are becoming rare.

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Despite the bad weather, he ______ get to the airport in time.

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The giant panda is now______.

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The______ is the air, water and land in or on which people, animals and plants live.

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Many plant and animal species are thought to be on the_______of extinction.