将本句改为被动语态,每空一词:People use knives for cutting things.Knives ______ ______ for cutting things.
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将本句改为被动语态,每空一词:The students clean the windows of their classroom twice a month.The windows of their classroom______ _______ twice a month.
将本句改为被动语态,每空一词:I found the ticket on the floor.______ ______ ______ ______ on thefloor.
将本句改为被动语态,每空一词:I told her to return the book in time.She ______ _______ to return the book in time.
将本句改为被动语态,每空一词:His doctor made him have only two meals a day.He ______ _______ _______ _______ only two meals a day.