题目内容
2．We organized a lot of activities to celebrate our school'sfiftieth （fifty） birthday．分析 我们组织了许多活动庆祝建校五十周年．
解答 答案：fiftieth．
提示词是基数词，根据所给单词结合 语境可以推测句意为"我们组织了许多活动庆祝建校五十周年．"，由于设空处单词后面跟单数名词birthday，所以应填序数词，表示"第五十"故答案为：fiftieth．
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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