问题描述：
Alice has two sisters.They are Mary and Ann.Mary i____ thirteen years old.Ann is seven years old.
Alice and Mary s____ in a middle school.Ann studies in primary s____.They are all good s____.(根据首字母提示补全短文）
Alice and Mary s____ in a middle school.Ann studies in primary s____.They are all good s____.(根据首字母提示补全短文）
问题解答：
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