9. Do not leave the room _____ you have finished the test.

8. He is explaining clearly _______ they could understand.

7. He speaks English ______ he were an Englishman.

6. We had no sooner got to the station _____ the train left.

5. We found the books two days ____ he had gone away.

4. We found the key _____ she had left it.

3. He will not go to the cinema _____ he is very busy.

2. He won’t be here _____ he is invited.

1. I haven’t heard from him _____ he went to America.

25. If it were not for the fact that you _____ ill, I would ask you to do this right now.

A. were　　　　　　　　 B. had been　　 　　 C. are　　　 　　　　 D. should be