20. ____________ sufficient rest from work, the civil authorities are attempting to make a breakthrough in limiting working hours.

　 A. Having ensured　　　　 B. To ensure　　　 C. Ensured　　　　 D. Ensuring

19. Of all the applicants, Tommy is _______ who fits the post.

A. one　　 　　　　 　　B. the one　　 　　　C. the other one　　　 　　 D. someone

18. During the rush hour, we got_________ in the traffic jam on our way back home.

A. held up　　　　　　　　　　 B. held back　　　　 C. held out　　　　　 D. held on

17. His answer was so confusing that I could hardly make any ______ of it at all.

A. meaning　　　　　　 B. sense　　　　　　　　　　 C. idea　　　　　　　　 D. significance

16. ___________ we were all worn out, the coach was willing to call it a day.

　　A. Until　　　 　　B. After　　　 　　C. When 　　　　D. Before