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1 I had  just finished
2 rang
3 went
4 had told
5 she was going
6 opened
7 saw
8 was
9was 
10 i had heard
11 shut
12 began
13 was going on
14 was
15 noticed
16 picked it up
17 realized
18 had pushed
19 I had never saw
20 began

1 he has been standing
2 had gone
3 how long did you revise
4 has been watching
5 haven t seen
 6 What were you doing 
7 was doing