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(改写) People use knives for cutting things. （改为被动语态）Knives _ _ for cutting things.
句型转换。一空一词
We use knives for cutting things.
Knives ________ ________ ________ ________ things.
选择并抄写单词
We use knives for ________(cut; cutting)things．
将下面句子变为被动语态，每空一词。
They use knives for cutting things．
Knives ________ ________ for cutting things．