17. Although it's raining, _____ are still working in the field.

A. they　　　　　 　　　 B. but they　　　　　　 C. and they　　　　　　 D. so they

16. I'll stay here _____ everyone else comes back.

A. even if　　　　 　　　 B. as though　　　　　 C. because　　　　　　 D. until

15. We didn’t go home _____ we finished the work.

A. since　　　　 B. until　　　　　　　　　 C. because　　　　　　 D. though

14. She was _____ tired _____ she could not move an inch.

A. so, that　　　 B. such, that　　　　　 C. very, that　　　　　 D. so, as

13. _____ the rain stops, we' 11 set off for the station.

A. Before 　　　　　　 B. Unless　　　　 　　　 C. As soon as 　　　 D. Though

12. _____ we got to the station, the train had left already.

A. If　　　　　　 　　　 B. Unless　　　　　　　 C. Since　　　　　　　　 D. When

11. I learned a little Russian _____ I was at middle school.

A. though　　　　 B. although　　　　　　 C. as if　　　　　　　　　 D. when

10. Busy _____ he was, he tried his best to help you.

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

9. _____ she was very tired, she went on working.

A. As　　　　　 B. Although　　　　　 C. Even　　　　　　　　 D. In spite of

8. _____ still half drunk, he made his way home.

A. When　　　　 　 B. Because　　　　　　 C. Though　　　　　　 D. As