21)6. broke; was doing; slipped

7. took; was painting

8. didn't go; was getting

9. were you doing

10. saw; was wearing

22)1. was playing; was reading; was sewing; heard

2. was leaving; caught

3. came in; was sitting

4. was shaving; cut

5. was; was standing

6. began; was smiling; was walking

7. was sleeping; rang

8. were sitting; drove

9. was crossing; struck

10. was drizzling; came

11. broke; was living

12. was getting; suggested

13. came; looked; stood; turned; went

14. was walking; met; asked

15. came; were eating

Надеюсь, всё правильно.