题目内容：

用适当的介词填空：

1.She always goes out for a walk after supper ________ the evening.

2.We often watch “CCTV News” on TV ________ 7 p. m.

3.It is a good idea to go for a walk ________ a sunny morning.

4.We have Computer classes ________ Mondays.

5.Birds fly to the south ________ autumn.