2. She will sing a song ____ she is asked.

A. if　　　　　　　　　　　 B. unless　　　　　　　 C. for　　　　　　　　　　 D. since

1. I’ll let you know ____ he comes back.

A. before　　　　　　　 B. because　　　　　　 C. as soon as　　　　 D. although

15. The boy was so tired __________ he fell asleep on the bus.

14. __________ you lock all the doors, he can still manage to get in.

13. He was angrier __________ ever before.

12. We’re doing everything we can to make things as easy for you ___________we can.

11. We would try to get a car __________we could all travel together more easily.

10.I didn’t join them yesterday evening __________ I had to go to an important meeting.

9. We came to the university, __________ we have learnt quite a lot.

8. They will help you __________ you meet with difficulty.