1. is
2. leaves
3. have
4. does ... come
5. have lost, saw
6. have ... been
7. have ... driven
8. get
9. have ... had
10. has been
11. went
12. will go
13. will give
14. come
15. will save
16. did not understand ... does (?)
does not understand ... has Mr. Smith done
17. is he speaking
18. bought
19. works
20. are you doing, am waiting