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7.If you want to cut the meat easily,you shouldsharpen the knife or you can't use it.

分析 如果你想轻易地切肉,你应该磨好刀,否则就不能用.

解答 答案:sharpen.
根据句子的形式可知,should后面需要跟动词原形,由前面的条件状语从句If you want to cut the meat easily可知,需要让刀变锋利才能更容易的切肉,所以用动词sharpen;故答案为sharpen.

点评 做完成句子注意解题步骤:1.分析每道题目需要完成部分的语法属性 2.划出已给出部分的中心词.依据空格前后成分,确定空格的语法属性:词性、单复数、时态等.

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