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"could you open the window, please?" If I'm talking to someone isn't very close to me, then I should say, "would you mind opening the window, please?"(用适当的关系词填空)
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After listening to the scientists had studied the problem, and citizens lived near the dam,the government turned to the United Nations for help in 1959.(用适当的关系词填空)
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Perhaps the best example is shown by UNESCO, runs a programme that prevents world cultural heritage sites around the world from disappearing.(用适当的关系词填空)