1 . The government has taken some measures to reduce traffic accidents, but it may be some time ______ the situation improves.
| A．since | B．when | C．unless | D．before |
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2 . Worry ___________ all others worry; rejoice after all others have rejoiced. (用适当的词填空)
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3 . It will not be long ____man can use the solar energy and make it serve mankind.
| A．since | B．before | C．when | D．after |
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4 . Jack was on the point of leaving ________ he noticed a man coming out of the room.
| A．when | B．while | C．after | D．before |
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5 . Mankind must have in mind that it will be years, even centuries, ______ the environment recovers from the damage he makes to it.
| A．that | B．before | C．when | D．since |
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6 . It wasn’t long ________ we were surrounded by enormous sand dunes towering above us on all sides. (用适当的词填空)
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7 . 在我们离开之前，我叫我妈妈买了含羞草(mimosa)。(before＋doing) (汉译英)
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8 . 科学家已经证明，睡前听轻音乐是一种有效的减压方式。（relieve）(汉译英)
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9 . 在参加面试前，你最好润色一下你的自我介绍。（polish）
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10 . You need a lot of mental, intelligent and physical training ________ you become an astronaut. (用适当的词填空)
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