1. was
2. met
3. have not seen
4. have you gathered
5. have you put
6. began
7. have done
8. began
9. has stopped
10. solved
11. has come
12. have never spoken
13. has just finished
14. Have you made
15. have you read, lived
16. have not yet come
17. was ill, he has recovered
18. has read
19. Have you booked, booked
20. have not seen, left, have changed