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The by-laws say that all dogs_______be kept on a lead in the park.

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

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We all regard pollution as a matter to human beings.

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

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The giant panda is now______.

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

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

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

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Unlike some other books about_______, it is unlikely that this will become a key text for those at the forefront of conservation action.

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Some______ animals become tame if they get used to people.

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Economic analyses of soil_______ conservation investments may be done from private and social perspectives.

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The society was set up to______ endangered species from extinction.

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The factory was fined for______ chemicals into the river.

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 Endangered species_______ by the World Wildlife Fund.

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Learners______ can feel very if an exercise is too difficult.