Question

 when,before,after,as, since,while,until, as soon as

1. Mum was making cookies in the kitchen       the telephone rang.

2. I was watching TV       my wife was cooking.

3. He had worked in the factory for two years       he went to college.

4. I shall play chess with you       I finish watching TV.

5. He didn't get to the airport       it was dark.

6. She sang       she went along the street.

7. I haven't heard from him       he went to America.

8. We found the books       he had gone away.

Answer 1

1. when   2. while   3. before   4. as soon as

5. until   6. as   7. since   8. after