Вставьте подходящий по смыслу предлог
1. on
2. in
3. on
4. in
5. at
6. at
7. on
8. on
9. in
10. about
11. on
12. at
13. on
14. on
15. at
16. on
17. in
18. on
19. in
20. at
21. at
22. in
23. at
24. to
25. to
26. to
27. in
28. at
29. on
30. from
31. to