用所给单词的正确形式填空
【小题1】A number of students (student) often help the old people on weekends.
【小题2】Thanks a lot for teaching (teach) us so well, Miss White.
【小题3】Tom is much thinner (thin) than his friends.
【小题4】He is not funny, and he is always very serious (serious).
【小题5】He would like to have (have) a cup of tea.
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解析：
【小题1】联系前文A number of 许多，可知填复数名词students，学生们，作主语。
【小题2】联系前文介词for，为了，可知填动名词teaching，教育，做宾语。动名词做宾语表示抽象动作。
【小题3】联系下文than his friends ，可知本句表示在两个事物中进行比较，故填thin的比较级thinner，注意以重读闭音节结尾的单词加er时，要双写最后一个辅音字母。
【小题4】联系前文系动词is及语境，可知填形容词serious，严肃的，做表语。
【小题5】句意：他想要喝一杯茶。不定式作宾语表示具体的将要进行的动作，结合语境可知填：to have。