1. After the war，a new school building was put up ________ there had once been a theatre.

　　A. that B. where C. which D. when

　　2. ____ he took part in the competition, he won a second prize.

　　A. For the first time B. At a time C. At one time D. The first time

　　3. I would appreciate it _______ you call back this afternoon for the doctor’s appointment.

　　A. until B. if C. when D. that

　　4. I had just started back for the house to change my clothes _____ I heard the voices.

　　A. as B. after C. while D. when

　　5. The class went on with the story _____ they had left it before the holiday.

　　A. where B. which C. in which Dwhen

　　6. The company has a free long-distance telephone number _____ customers may call with any questions they have about its products.

　　A. although B. as C. even if D. so that

　　7. --- Is Mr. Smith in the office?

　　--- Yes，________ he is in charge of the office，he must be there.

　　A. since B. however C. whether D. for

　　8. Someone called me up in the middle of the night，but they hung up ________ I could answer the phone.

　　A. as B. since C. until D. before

　　9. --- Don’t look down upon Bob. He has his own advantages.

　　--- Oh, yes. ________ others are weak, he is strong.

　　A. If B. When C. Where D. Though

　　10. The day must be breaking, _____ the birds have begun singing.

　　A. because B. as C. for D. since

　　11. John may phone tonight. I don’t want to go out ________ he phones.

　　A. as long as

　　B. in order to C. in case D. so that

　　12. ____others say, the expert is sure that his theory is correct

　　A. No matter B. It doesn’t matter C. Whatever D. What

　　13. Many places are flooded by heavy rainfalls, so they can’t walk _______ they like these days.

　　A. when B. whenever C. where D. wherever

　　14. His father began to work ______ his childhood.

　　A. since B. before C. as early as D. while

　　15. The roof fell _____ he had time to dash into the room to save his baby.

　　A. before B. as C. after D. until

　　16. --- The thread of my kite broke and it flew away.

　　--- I had told you it would easily break ________it was the weakest

　　A. when B. where C. unless D. since

　　17. The crowd started cheering ______ he rose to speak.

　　A. as B. since C. till D. where

　　18. I had worked here ______ you came here. But I shall leave for England ______.

　　A. before long, before long B. before long; long before

　　C. long before, before long D. long before; long before

　　19. Scientists say it may be five or ten years _____ it is possible to test this medicine on human patients.

　　A. since B. before C. after D. when

　　20. ___ the Internet is bringing the distance between people, it may also be breaking some homes or will cause other family problems.

　　A. When B. If C. As D. While