Question

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.

Answer 1

1.drunk..when i was coming
2. walked...was passing
3. thought...was falling
4. listened
5. entered... was writing....were copying 
6. got...began
7.was having
8.came...was doing
9.were you doing
10.was going

Answer 2

They (the drink) tea when I (come) home. 2. He (went) down the river when the boat (floated). 3. The old man (thought) about his plan when he slept at night. 4. We (streaming) to an interesting lecture yesterday. 5. When I (came) in the class, the teacher (written) words on the board ADN students (for rewriting) them in their training - books. 6. They are (were) ready to go when (started) rain. 7. Yesterday at 1:00 I (ate) lunch in the dining room. 8. When he (came), I (did) my exercises. 9. What you (do) at eight o'clock yesterday? 10. At this time yesterday I (went) home.