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3) 1) We were having breakfast when the telephone rang. 2) She met a lot of friendly people while she was working in Russia 3) When they left the gallery, the sun was shining. 4) The students were laughing when the professor came in. 5) While the children were sleeping, their parents watched TV. 6) It started to snow while she was coming back from the opera 7) When Pete opened the door, it was raining 8) While Evgeny was sunbathing his wife was swiming in the sea 9) heard; was talking 10) was taking ; ate 11) was texting ; arrived  12) broke; was skateboarding 13) listened ; was cooking 14) was driving ; stopped 15) noticed ; was watching 16) fell off ; was painting 17) were waiting ; surfed 18) became ; was travelling 19) What were you doing when you heard about this accident? 20) My sister said that she didn't feel happy so I talked to her