Ответ:

1.was snowing,leaved

2were siting, started

3 She was listening

4 was talking,was seeing, finished

5was coming, happened

6you were staying,was visiting,

7 moved,was living

8many people waited

9was dancing

10 was studying ,falled

11were working, discovered

12were climbing ,seed

13was having,ringed

14was running,was collided

15was carrying,was dropped

16-

17were reading , finished

18 was arriving, waited

19Were you listening , explained

20was playing ,singed