Ответ:
1. Jane washed all the test-tubes after she had completed the experiment.
2. She had done the cleaning by 6 o'clock yesterday.
3. After the stewardesses served lunch to the passengers, they had calmed down.
4. I had not had(⁉)my watch, so I didn't know the exact time.
5. He felt sick because he had eaten too much.
6. She had finished report, and was feeling rather tired, so she went to bed.
7. By two o'clock he answered all the letters he to had received.
8. The bus had left before I reached the bus station.
9. As soon as they had finished breakfast, they run out to play.
10.When we met our friends they had already knew the news.
11.When you called me, I had not done the sum yet.
12.She intered to make a cake for you, but she had run out of time.(?)
13.Hardly we had gone to bed when somebody knocked at the door.
14.No sooner she had come than she fell ill.