Решение:
- George fell off the ladder while he was painting the ceiling.
- Last night I was reading in bed when suddenly I heard a scream.
- Were you watching television when I phoned you?
- Ann was waiting for me when I arrived.
- I was not driving very fast when the accident happened.
- I broke a plate last night; I was doing the washing-up when it slipped out of my hand.
- Tom took a photograph of me while I was not looking.
- We went out because it was raining.
- What were you doing at this time yesterday?
- I saw Carol at the party. She was wearing a really beautiful dress.
Ответ: 1. fell, was painting; 2. was reading, heard; 3. Were you watching; 4. was waiting, arrived; 5. was not driving, happened; 6. broke, was doing, slipped; 7. took, was not looking; 8. went, was raining; 9. were you doing; 10. saw, was wearing.