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    语法填空。

    If the population of the Earth keeps on increasing at its present rate, there will eventually not be enough resources 1.(leave) to support life on the planet. By the middle of the 26st century, if present trends continue, we 2.（use）up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on the earth will make 3.necessary for us to look for open space somewhere else. But 4. of the other planets in our solar system are capable of supporting life at present. One possible solution 5. the problem, 6., has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes 7. before the Earth’s resources are 8.(complete) exhausted it will be possible to change the atmosphere of Venus and therefore create a new world almost as large as the Earth9..The difficulty is that Venus is much hotter than the Earth. 10., there is only a tiny amount of water there.

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