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Ответ:

1) was doing

2)were riding

3)was walking

4)was wearing

5)were studying

6)was correcting

7)were drinking

8)was cutting

9)was singing

10)was carrying

11)was driving

12)was painting

13)were shouting

14) were ordering

15)was playing

16)was talking

17)was ringing

18)was hiding

19)was having

20)were fishing