题目内容
5．I have tried three times，and the teacher asks me to have afourth（four） try．分析 我已经尝试了三次了，老师要求我再试一次．
解答 答案：fourth．
提示词是基数词，根据所给单词结合 语境可以推测句意为"我已经尝试了三次了，老师要求我再试一次．"，由于设空处单词前面有不定冠词a，后面跟单数名词，所以应填four的序数词forth，不定冠词与序数词连用表示在原来的数量之上再加上"又一个"的数量概念，故答案为：fourth．
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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