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3．Paul is hard-working and always does well in his lessons．It is unusual for him to fail an exam．

分析保羅學習很努力，每門功課總是做的很好，對于他來說，考試不及格是很不尋常的．

解答答案：unusual．
根據"Paul is hard-working and always does well in his lessons．"保羅學習很努力，每門功課總是做的很好，又根據"for him to fail an exam"結合給出的首字母提示u，因此可知這句話的意思是"對于他來說，考試不及格是很不尋常的．"空格前面是系動詞is，所以空格處需要用形容詞來填空，綜上所述，故填unusual．

點評首先要掌握句子的意思，然后結合具體的題目，就可以確定正確答案．

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