20. The writer of the article _______ his opinion very clearly.

　 A. explains　　 B. states 　　　　 C. declares　 　D. asks

19. -Mum, can I go out to play football with Jessica?

-No, you can’t _______ your homework is done.

A. before　　 B. until　　　 C. as　　　　 D. when

18．It is quite difficult sometimes to _______ the budge because of increased costs.

A. weigh　　　 B balance 　　 C add　　 　　 D. put

17．I'm certain David's told you his business troubles. _______, it's no secret that he owes a lot of

money to the bank.

A. However 　　　B. Anyway　　 　　　 C. Therefore　　　 D. Though

16. Joe gave Lynne a _______ glance to see if she was OK.

　 A. speedy　　　　 B. fast 　　　　 C. quick　　　　 　 D short