Past Simple Past Continuous.
1.They (to drink) tea when I (to come) home.
2. He (to walk) along the river when a boat (to pass).
3. The old man (to think) about his plan when he (to fall) asleep.
4. We (to listen) to an interesting lecture yesterday.
5. When I (to enter) the classroom, the teacher (to write) words on the blackboard adn the pupils  (to copy) them into their  exercise - books.
6. They (to get) ready to go out when it (to begin) raining.
7. Yesterday at one o'clock I (to have) lunch at the canteen.
8. When he (to come) in, I (to do) my exercises.
9. What you (to do) at eight o'clock yesterday?
10. At this time yesterday I (to go) home.