Unit 2, Past tenses

Supply correct past tenses:
1. We ------- (see) an accident while we ------(wait) for the bus. 2. I couldn`t speak to them because when I --------(phone) they ----------(go out). 3. He was very nervous when he --------(drive) across France last month because he ----------(not drive) on the right before. 4. While she ---------(prepare) lunch, she -------(cut) herself. 5. We realized that we --------(meet) before as soon as we -------(see) each other. 6. Which countries -------(they ; visit) when they --------(travel) round the world ? 7. ---------- (you ; work) in the garden when I -------(come) to the house? 8. She ------(spend) a lot of hours studying for her exam because she ----------(already ; fail) it twice. 9. -----------(they ; not live) in Canada when they --------(meet) each other ? 10. They ----------(live) in their house for twenty years when they --------(decide) to sell it
11. I (watch) TV and Barbara (read) a book at 9pm yesterday.
12. Last Sunday when Bob (paint) windows, Mary (work) in the kitchen.

ANSWERS 1-1. We saw an accident while we were waiting for the bus. 2. I couldn`t speak to them because when I phoned they were going out 3. He was very nervous when he was driving across France last month because he had not driven on the right before. 4. While she was preparing lunch, she cut herself. 5. We realized that we had met before as soon as we saw each other. 6. Which countries did they visit when they traveled round the world ? 7. Were you working in the garden when I came to the house? 8. She spends a lot of hours studying for her exam because she has already failed it twice. 9.Were not they living in Canada when they met each other ? 10. They had lived in their house for twenty years when they decided to sell it 11. I was watching TV and Barbara was reading a book at 9pm yesterday.
12. Last Sunday when Bob was painting windows, Mary was working in the kitchen.