12. -- The thread of my kite broke and it flew away. 　　 -- I had told you it would easily break __a__ it was the weakest. 　 A. when　　　 B. where　　　 C. unless　　　 D. since 13. The crowd started cheering ___a___ he rose to speak.　　　　 　 A. as　　　　 B. since　　　 C. till　　　　 D. where

11.The roof fell ___a___ he had time to dash into the room to save his baby. 　 A. before　还未　 B. as　　　　 C. after　　　 D. until

7. He got excited at the news，__b_____ I was calm. 　　 A. when　　　　 B. while　　　 C. because　　　 D. after 8. -- Shall Brown come and play computer games? 　　 -- No，____a___ he has finished his homework. 　　 A. when　　　 B. if　　　 C. unless　　　 D. once 9. Hardly had he arrived in Hong Kong ____a___ she rang me up. 　　 A. when　　　 B. than　　　 C. that　　　　 D. and 10.___a_/b___ they heard the shout for help，they rushed out. 　　 A. Immediately　　　 B. The moment 　　 C. The while　　　　 D. All the above

6. By the time you ____c___ back，the supper _______ ready. 　　 A. will get；will be　　　 B. get；was 　　 C. get；will be　　　　　 D. will get；is

5.I had cut the meat into pieces __a __　 Mother started cooking. 　　 A. when　　　 B. as soon as　　　 C. after　　　 D. while

4.I was about to leave my house ___b_____ the phone rang. 　　 A. while　　　 B. when　　　 C. as　　　 D. after

1.I saw Mr. Smith last Sunday. We had not seen each other ___b___ I left London. 　　 A. as　　 B. before　　　 C. since　　　 D. till 2. I’ll be back before you __c_____. 　　 A. will leave　　 B. will have left　　 C. leave　　 D. would leave 3. The problem won’t be settled until we ___a___ a chance to discuss it thoroughly. 　　 A. have had　　 B. will have　　

C. will have had　　 D. would have

10. No sooner had I arrived home ___d__ it began to rain.

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

9. The children ran away from the orchard(果园) __a____ they saw the guard.

A. the moment B. after C. before D. as

8. ___c__ John was watching TV, his wife was cooking.

A. As B. As soon as C. While D. Till