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A.

4. He was eating lunch when we arrived.

5. While she was watching the TV, she heard the doorbell.

6. What was your little brother doing this time yesterday?

7. At 9 o'clock last Sunday, I was doing Math homework.

8. Was she studying English at 8pm yesterday?

B.

1. A serious road accident happened while we were waiting for the bus yesterday.

2. We cleaned up everything before we left the campsite.

3. I'll go out with my friends after i get my parents' permission.

4. I'll call my mom as soon as i get my result.

5. My father usually drives me to school when it rains.

6. I usually drink a glass of warm milk berfore I go to bed.

7. The taxi arrived when Elie was having lunch.

8. You should wait here until your parents come back