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1 had been crying2 came,had,helped3 didn't work4 were having5 got6 had finished -rang7 wasn't reading8 had been preparing9 had snowed(had been snowing)10 had arrived-phoned11 was washing(had washed)-came12 saw-was thinking13 was sitting-was-had been running14 did you go15 invented16 what was he doing when you found 17 came,opened,had bought ,began18 had done,were19 didn't know20 when was Pushkin born ?