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

分析 如果你想輕易地切肉，你應(yīng)該磨好刀，否則就不能用．

解答 答案：sharpen．
根據(jù)句子的形式可知，should后面需要跟動詞原形，由前面的條件狀語從句If you want to cut the meat easily可知，需要讓刀變鋒利才能更容易的切肉，所以用動詞sharpen；故答案為sharpen．

點(diǎn)評 做完成句子注意解題步驟：1．分析每道題目需要完成部分的語法屬性　2．劃出已給出部分的中心詞．依據(jù)空格前后成分，確定空格的語法屬性：詞性、單復(fù)數(shù)、時態(tài)等．

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