Ответ:

1. sinked

2. has stolen

3. has fallen

4. have seen

5. walked

6. lived

7. have cut

8. lost

9. visited

10. has lived

11. worked

12. have / finished

13. have never been

14. has played / was

15. have finished

16. have worked / began

17. have already eaten

18. learned / has not played

19. have bought

20. went / ...