1. at 6 o’clock
2. at night
3. on Wednesday
4. in 1987
5. on November 20th
6. in winter
7. on Monday
8. in the afternoon
9. on Friday
10. at midnight
11. in Eid
12. on spring
13. on Christmas
14. on Friday
15. in 1990
16. in December
17. in autumn
18. in the evening
19. on Monday
evening
20. at 3 o'clock
21. at noon