What are the missing prepositions in the sentences?

1. in June, 2. at 9 o’clock, 3. on Wednesday, 4. in 2013, 5. in the morning, 6. at night, 7. on Thursday, 8. in November, 9. on the 15th of June, 10. at the weekend, 11. in the afternoon, 12. in March, 13. at half past six, 14. on the 2nd of July, 15. at 12:00, 16. on Saturday, 17. in winter, 18. in the evening, 19. at half past eleven, 20. in 1991, 21. on Friday, April 17, 2020, 22. on Easter Day, 23. in spring, 24. at 9:15, 25. in autumn, 26. on Sunday, 27. in December, 28. on Christmas Day.