1. were living, went
2. spent
3. has lost
4. have returned
5. discovered
6. didn't know, had discovered
7. have already read
8. had discussed, took
9. has baked
10. had been reading
11. have never been
12. told, had got
13. did you receive
14. had been cooking
15. has bought
16. traveled
17. haven't seen
18. ate, had brought
19. had had, went
20. have you ever been