用适当的介词填空（初一）

题目

用适当的介词填空（初一）
Classes begin(开始）____ 8 o'clock
Do you get up early____weekends?
My little sister often gets up___seven o'clock
Thanks____ your letter.
What do you do____ the morning?
He goes to the park(公园）____Monday morning.

答案

at
on
at
for
in
on