Ответ:

1. We were having breakfast when the telephone rang.

2. She met a lot of friendly people while she was working in Russia.

3. When they left the gallery, the sun was shining.

4. The students were laughiing when the professor came in.

5. While the childrern were sleeping, their parents were watching TV.

6. It started to snow while she was coming back from the opera.

7. When Pete opened the door, it was raining.

8. When Evgeny was sunbathing , his wife was swimming in the sea.

9. She heard a loud bang while she was talking to her friend.

10. While he was taking a shower, his cats ate his steaks.

11. When I was texting the school bus arrived.

12. llya broke his leg while he was skateboarding.

13. He was listening to music while he was cooking breakfast.

14. My sister drove at 120 km/h when a policeman was stopped her.

15. The boy was noticed that a girl  watched him.

16. My granddad fell off the ladder while he was painted the celling.

17.  While they were waited, they were surfed the Net.

18.  Tim became sick while he was traveled in China.

19.  What do you did when you heared about the accident?

20.  My sister said that she didn`t felt happy, so I talked to her.

Объяснение: