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Ответ:

1. haven't done

2. have studied

3. has promised

4. has cleaned

5. has written, has sent

6. has seen

7. have painted

8. has taken

9. hasn't rained

10. has already left

11. have you visited

12. have called

13. have been

14. have known

15. Has somebody smoked?

16. has she bought

17. has eaten

18. have painted

19. has been

20. has deserved