Somwe people go to bed at night and get up late in the morning.This is not good for them.

问题描述:

Somwe people go to bed at night and get up late in the morning.This is not good for them.
We must _____ at night when it is dark.
The dark helps us to sleep well.When day breaks,we must get up.It is t___ for exercises.Exercise means doing things with the body.

1.We must sleep/go to bed at night when it is dark.2.The dark helps us to sleep well.When day breaks,we must get up.It is time for exercises.Exercise means doing things with the body.