14. There have been ten thousand visitors to the exhibition since______.

　 A. its opening　　　 B. it’s opening　　 C. it opens　　　 D. one month

13. It is at least three years______ these trees were planted.

　 A. that　　　　　　 B. when　　　　　 C. since　　　　 D. as

12. He was so interested in the book that he had read for three hours______ he realized it.

　 A. since　　　　　 B. before　　　　 C. until　　　　 D. as

11. No sooner_____ he realized that he should have remained silent.

　 A. had the words been spoken then

　 B. had the words been spoken when

　 C. had the words been spoken when

　 D. the words had been spoken than

10. Hardly_______ the airport when the lane took off.

A. I had arrived at　　　　　　　　　　　 B. had I arrived

C. had I reached　　　　　　　　　　　 D. I had got to

9. He likes playing the violin while his brother______ in for all kinds of sports.

A. go　　　　　　　 B. goes　　　　 C. is going　　　 D. likes going

8. When it _______ water can be turned into vapour.

A. does heat　　　　 B. is hot　　　　 C. heated　　　　 D. is heated

7. He will come to call on you the moment he_______ his painting.

A. will finish　　　　 B. finished　　 C. has finished　　 D. had finished

6. I was about to leave my house______ the telephone rang.

A. while　　　　　　 B. as　　　　　 C. when　　　　 D. and

5. I am to stay_______.

A. until my grandmother gets well　　　　　　 B. until my grandmother will get well

C. when my grandmother gets well　　　　　　 D. before my grandmother will get well