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Упражнение 1

1)was writing

2)was going,met

3)was driving

4)were sitting

5)was studying

Упражнение 2

1)were playing,was knitting,was cleaning,were reading

2)was walking,saw,was waiting,was sitting

3)was riding,was shining,were singing

Упражнение 3

1)was walking,began

2)were you reading

3)was digging,hurt

4)was waiting

5)was she driving,happened

6)were having

7)were playing

Упражнение 4

1)Kim was crossing the street when he saw Jane

2)I was serving the table when she dropped a glass