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15．When one'sconcentration（concentrate） is slipping，he may have a hard time writing or reading．

分析當一個人的注意力不集中時，他可能會很難去進行閱讀或寫作．

解答答案：concentration
此處用在名詞的所有格one's之后，在從句中作主語，意為：一個人的注意力，故用動詞concentrate的名詞形式；由于concentration在本句中表達的是抽象概念，因此它是不可數名詞；故填concentration

點評本題考查了名詞的用法；做本題時，首先根據句意及空缺處在句中的位置，確定此處單詞的詞性；其次在確定了應填名詞之后，還要考慮到名詞的單復數；另外，本題還考查到了構詞法的知識，因此在學習過程中，應注意總結構詞方面的一些規律．

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