Put in in/on/at.

1) Do you sometimes watch TV ____ the mornings?

2) Are you usually at home ____ 7 o'clock ____ the evenings?

3) Do you sometimes work ___night?

4) What do you usually do ____ weekends?

5) Do you usually go shopping ____ Saturdays?

6) Do you go skiing ____ the winter?

7) Do you have a holiday ____ December?

8) Is there a holiday in your country ____ 6 , January?