They use the machine to keep the room cool(在线等候)急!

题目

They use the machine to keep the room cool(在线等候)急!
改为被动语态
They use the machine to keep the room cool
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He give me a dictionary
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we should make a telephone call to him at once
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we must take good care of young trees
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they will produce about 400 cars in their factory next month
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答案

The machine is used to keep the room cool by them.I am given a dictionary by him.A dictionary is given to me by him.A telephone call should be made to him at once by us.He should be made a telephone c...