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

7.____a___I listen to your advice, I get into trouble.

A. Every time B. When C. While D. Until

6. He was about to go to bed ___d_____ the doorbell rang.

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

5. I recognized you ____a____ I saw you at the airport.

A. the moment B. while C. after D. once　

4. ___once一旦____ you begin, I think you must continue.

A. When B. Whenever C. Once　 D. Even if