1 . That we should wear masks in public places during the epidemic(疫情) is necessary.(用It做形式主语改写句子)
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2 . That her hair was turning grey worried her a bit. (用it作形式主语改写句子)
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3 . 轮到汤姆做自我介绍了。
________ is Tom’s turn ________ himself.
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4 . It is wise to e________ active sports at your age (从事,参与). (根据中英文提示填空)
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5 . To help people out of trouble is his lifelong mission.(用it做形式主语改写)
_______________
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