Ответ:

1) checked

2) was eating

3) was waiting

4) remembered

5) was deciding

6) arrived

7) was getting

8) got

9) found

10) was cleaning

11) was thinking

12) saw

13) was driving

14) was

15) stopped

16) was walking

17) closed

18) opened

19) knew

20) was standing

Объяснение: