Ответ:

1. on

2. in

3. at

4. on

5. in

6. at

7. at

8. at, on

9. on

10. at, on

11. in

12. on

13. in

14. on

15. in

16. on

17. on

18. on

19. at

20. at

21. at

22. in

23. on

24. in

25. on

26. on

27. on

28. at

29. in

30. in