79 Fill in "at", "in" or "on" as in the example:

1. On Saturday. 2. In July. 3. In 1984. 4. On March 25th. 5. On Friday. 6. In summer. 7. In the morning. 8. At 9 o'clock. 9. At Christmas. 10. On September 28th. 11. In 1991. 12. On August 29th. 13. On Thursday afternoon. 14. In the evening. 15. In autumn. 16. At half past two. 17. On Monday morning. 18. At Easter. 19. At 10 o'clock. 20. In winter. 21. At noon. Объяснение: * On используется с днями недели (Saturday, Friday), датами (March 25th, September 28th, August 29th), и днями недели с частью дня (Monday morning, Thursday afternoon). * In используется с месяцами (July), годами (1984, 1991), временами года (summer, autumn, winter), и частями дня (the morning, the evening). * At используется с точным временем (9 o'clock, half past two, 10 o'clock, noon), и праздниками (Christmas, Easter).