Exercise 3. Complete the questions with in, on or 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?