1. What were you doing (Past Continuous) when I called (Past Simple) you?2. They were cleaning (Past Continuous)the windows when it started  (Past Simple) to rain.3. Nora was riding (Past Continuous) her bicycle when she noticed (Past Simple)a nice kitten.4. While I was doing (Past Continuous)my homework the telephone rang  (Past Simple).5. While we were washing (Past Continuous)the floor we found (Past Simple)a key.6. He heard (Past Simple)a loud noise when he was sitting (Past Continuous)in the garden.7. Linda was typing (Past Continuous)a letter when her boss arrived (Past Simple).8. Melany was cooking(Past Continuous) dinner when her husband came (Past Simple) home.9. When he was driving (Past Continuous)to work, he remembered (Past Simple)that his briefcase was (Past Simple) still at home.10. Kelly was looking (Past Continuous) out of the window when she saw Mike.