Chia động từ trong ngoặc.
1. She met him while she ……………… (travel) on a train.
2. While the woman was getting off the bus, she ……………… (fall down).
3. The thief ……………… (break) into while we were sleeping.
4. Lan took a photo while I ……………… (not/look).
5. While my mum was working in the garden, she ……………… (hurt) her back.
6. We were living in Hanoi when our old aunt ……………… (die).
7. When I got up this morning, it ……………… (rain) heavily.
8. While my dad was brushing teeth, my mum ……………… (fall asleep).
9. I saw a nightmare while I ……………… (sleep) last night.
10. What happened in your dream while a monster ……………… (chase) you?
11. He ……………… (study) Chemistry when my friends ……………… (come) around.
12. While Hoa ……………… (walk) in the street, she ______ (meet) her ex.
13. Her baby ……………… (wake) up while she ______(wash) the dish.
14. He ……………… (work) when her wife ……………… (phone) him.
14. The students ……………… (have) a test when the storm ……………… (start).