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13．No matter how difficult things seem to be，you should say toyourself，"Never mind!"A positive attitude is the key to success．

分析不管事情有多么困難，你應該對自己說："沒關系"，積極的態度是成功的關鍵．

解答答案：yourself．
根據所給信息提示結合語境推測句意是"不管事情有多么困難，你應該對自己說："沒關系"，積極的態度是成功的關鍵．"，根據句意判斷填反身代詞，所填單詞"你自己"是yourself，所以答案是：yourself

點評做這類題型，首先根據所給信息明確句意，推斷句子所要考查的單詞的拼寫，再結合相關語法知識對單詞做出形式上的變化．

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