Complete the questions. Add in, on, or at.

1. Do you sometimes watch TV in the mornings? 2. Are you usually at home at 7 o'clock in the evenings? 3. Do you sometimes work at night? 4. What do you usually do at weekends? 5. Do you usually go shopping on Saturdays? 6. Do you go skiing in the winter? 7. Do you have a holiday in December? 8. Is there a holiday in your country on 6 January?