1 While we were walking home last night, it started to rain. (walk / start) 2 I was doing my geography homework when you phoned. (do / phone) 3 When I arrived at the cinema, my friends were waiting for me. (arrive / wait) 4 What were you doing when you heard the news about the accident? (do / hear) 5 Were you listening to the teacher when she explained this exercise? (listen / explain)