1. 从方框中选择适当的单词补全下列句子。

in    on    at

1. （1） We will have a Christmas party December.
3. （2） I often go to school 6 o'clock.
5. （3） My family usually takes a trip summer.
7. （4） They will have a football match Saturday morning.
9. （5） My father always comes home night.