1. didn't open
2.was hurrying, met
3.broke, was skiing
4. was driving, rang
5. was sleeping, was sitting
6. cleaned, ironed, made
7. was reading, heard
8.were drinking, came
9. was walking, passed
10. was thinking, fell
11. listened
12. entred,was writing, were copying
13. were getting, began
14. was having
15. came, was doing
16. were you doing
17. was readkng,came, sat
18. was walking, passed
19. was looking, saw
20. were answered, entered