小博士：时间名词前可以用的介词在初中阶段学的主要有5个，可以用下面的速记歌来帮助学习。

　　年月之前要用“in”，遇到日期却用“on”。

　　上午下午又是“in”，某日上下午“on”帮忙。

　　正午、晚上用“at”，黎明、午夜也相宜。

　　时钟之前也是“它”，差分过秒不用“它”

　　说“差”要用介词“to”，说“过”要用“past”。

　　多说多练牢牢记，学好英语本事大。

记住了吗？那么就请信心十足地动手做下面的介词填空练习吗：

1　　My birthday is ________Dec. 1st.

2　　He was born ________ 1991.

3　　The People's Republic of China(中华人民共和国) was founded (成立) ________ October 1st 1949.

4　　It was happened(发生) ________ the morning of a cold day.

5　　－Do you have time ________ Sunday evening?

　　 －I'm afraid not. But I am free ________ the afternoon.

6　　I usually go to bed ________ 9:00, but ________ weekends, I'm later.

7　　New school year begins ________ September.

8　　You can get cheap things ________ this time of year.

9　　We enjoy ourselves ________ Children's Day.