Chương 34. Bài Tập (Exercises) (tr.507)

VI.

1. When Don arrived, we were having coffee.
2. He sat down on a chair while I was painting it.
3. The students were playing a game when the professor arrived.
4. Felix phoned the fire brigade when the cooker caught fire.
5. While he was walking in the mountains, Henry saw a bear.
6. When the starter fired his pistol, the race began.
7. I was walking home when it started to rain.
8. When Margaret opened the door, the phone was ringing.
9. He was sitting in the garden when a wasp stung him on the nose.
10. While he was running for a bus, he collided with a lamp post.
11. Vicky was having a beautiful dream when the alarm clock rang.
12. When Alex saw the question, he knew the answer immediately.
13. The train was waiting when we arrived at the station.
14. Sarah had an electric shock when she touched the wire.
15. When the campers woke, they saw the sun was shining.