1 . __________ caused the accident is a complete mystery.（用适当的词填空）
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2 . It is often the case ________________ things may cause discomfort for people if they are not in their proper place. (用适当的词填空)
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3 . ________________ matters to a museum is not how many visitors it has, but ________________ close it is to people’s daily lives. (用适当的词填空)
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4 . It is uncertain ________________ side effects the new medicine will bring about. (用适当的词填空)
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5 . 足球是玩起来如此简单的一项运动或许是它受欢迎的基础。(汉译英)
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6 . It is uncertain ________ team will win in the final contest. （用适当的词填空）
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7 . ________ they suddenly disappeared remained a mystery. （用适当的词填空）
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8 . ________________ (让我感到印象最为深刻的是) was the relay race for the boys. Fighting for their classes, every one of them had to cooperate with each other and performed the best. The classmates cheered them on.(根据汉语提示完成句子)
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9 . 计算机何时会比人类更聪明仍然是一个问题。（用名词性从句翻译句子）
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