Choose the correct verb form to complete the sentences.

1. 1. While I __________ (walk) to school, I __________ (see) a cat.
2. 2. Yesterday, she __________ (buy) a new dress.
3. 3. We __________ (watch) TV when the power went out.
4. 4. He __________ (study) when his phone rang.
5. 5. They __________ (play) football last Saturday.
6. 6. I __________ (cook) dinner when my friend __________ (arrive).
7. 7. She __________ (read) a book while he __________ (listen) to music.
8. 8. We __________ (drive) to the airport when we __________ (hear) the news.
9. 9. While Tom __________ (sleep), his sister __________ (finish) her homework.
10. 10. The teacher __________ (talk) when the bell __________ (ring).