Fill in when or while.

1. I saw her she was crosssing the street.
2. we were playing chess we heard a loud voice calling for help.
3. I was talking on the phone Dad came into the room.
4. she arrived at the station the train had already left.
5. It was already late we got home.
6. I met him he had already done the job.
7. Mum was ironing the clothes Dad was washing the car.
8. we visited them they had just come back from their holidays.
9. he was walking in the forest he saw a wolf.
10. the teacher entered the classroom we were listening to music.