Ответ:

1 was walking, happened

2 finished, packed, went

3 saw

4 got, has already gone

5 were chatting, opened, entered

6 were you doing

7 got, had listened

8 found, started

9 has missed

10 was checking, called

11 lost

12 had left

13 was drawing, played

14 didn't go, had seen

15 were watching, rang