1 had been crying
2 came,had,helped
3 didn't work
4 were having
5 got
6 had finished -rang
7 wasn't reading
8 had been preparing
9 had snowed(had been snowing)
10 had arrived-phoned
11 was washing(had washed)-came
12 saw-was thinking
13 was sitting-was-had been running
14 did you go
15 invented
16 what was he doing when you found
17 came,opened,had bought ,began
18 had done,were
19 didn't know
20 when was Pushkin born ?