17. A. always B. often C. no D. never
16. A. unless B. after C. until D. once
15. A. half B. lower C. higher D. full
14. A. straight B. deeply C. closely D. totally
13. A. excited B. shocked C. worried D. disappointed
12. A. tested B. studied C. examined D. experimented
11. A. the price B. the matter C. the weight D. the name
10. A. falling behind B. setting foot C. lending a hand D. putting forward
9. A. applied B. guided C. followed D. linked
8. A. performed B. smiled C. disagreed D. announced