1. The girl
(was cooking) dinner when the lights (went) out. She (burnt) herself.
2. The boy (hurt) himself while he (was skating).
3. When the woman (entered) the room, the children (were feeding) the goldfish.
4. When I (was visiting) my friends in Denmark, I (bought) two presents for my family.
5. When it (started) to rain, we (were bathing) in the river.
6. Yesterday at one o'clock I (was having) lunch at the canteen.
7. When he (came) in, I (was doing) my exercises.
8. What (did you do) at eight o'clock yesterday?
9. At this time yesterday I (was going) home.
10. You (were sleeping) when I (went) out.
11. He (was reading) on the sofa when I (came) in and (sat) down beside him.
12. I (was walking) along the street with my friend when a tram (passed).
13. She (was looking) out of the window when I (saw) her.
14. We (were answering) the teacher's questions when the headmistress (entered)
the classroom.
15. They (were drinking) tea when I (came) home.
16. He (was walking) along the river when a boat (passed).
17. The old man (was thinking) about his plan when he (fell) asleep.
18. We (listened) to an interesting lecture yesterday.
19. When I (entered) the classroom, the teacher (was writing) words on the
blackboard and the pupils (were copying) them into their exercise books.
20. They (were getting) ready to go out when it (began) raining.