19. Math is a _______ subject for both arts and science students.

　　 A. compulsory　　　　 B. must　　　　 C. concrete　　　　　 D. obliged

18. The rapid development of science and technology make the ______ among people more and more convenient.

　　 A. competition　　 B. communication　　 C. companion　　 D. comprehension　

17. Meg realized she'd been a ________ fool.

　　 A. complete　 　B. commercial　　 　C. content　　 　　D. constant

16. Every four years athletes from all over the world _______for medals in the Olympic Games.

　　 A. fight　　　 B. struggle　　　　 C. complete　　　　 D. compete

15. __________ with other children, the father thinks, Jack is a most satisfying son.

A. Commenting　　 B. Complaining 　　C. Compared　　　 D. Committed

14. It is said that dogs will keep you ______ for as long as you want when you are feeling lonely. (2006年高考江西卷)

　 　A. safety　　　 　B. company　 　　C. comfortable　　 　　　D. friend

13. When you want to introduce yourself to an American, you can just try a _______ greeting, such as “Hello, my name is…”

A. commonly used 　B. used commonly　 C. commonly using　 D. using commonly

12. _______ other nurses, Alice is careful and patient.

　 A. Looking like　　 B. Comparing with　 　C. In common with　　 D. As to

11. Letterboxes are much more _______ in the UK than in the US, where most people have a mailbox instead. (2006年高考浙江卷)

　 A. common　　　 　 B. normal　 　　　 C. ordinary 　　　　D. usual

10. It is surprising that such an innocent-looking man should have ________ such a crime.

　 A. confirmed　　 　B. clarified　 　　C. committed　　 　D. conveyed