31. 一He ought to have been warned of the danger．

　 　　　- _______but he wouldn't listen to me．

　 　　　A．He did　　 　　　B．He should　　 　C．He ought to 　　D．He was

30．Is this research center ______you saw the modern equipment last year?

　 　　　A．which　　 　　　B．that　　 　　　C．the one where 　D．the one that

29. Mr．Johnson tried to get rid of the man who _______ him but in vain．

　　　 　A．was following　 B．has followed　 C．had followed 　D．would follow

28．-Do you like the red hat，the blue hat or the yellow one7

　　 　　- _______. I really don’t care.

　 　　　A．All　　 　　　B. Both　　 　　C．Anyone 　　　D．Any

27．I don’t think this film is by far the most boring，I have seen ____．

　 　　　A．better　 　　B. worse　　 　C．the best 　　D．the worst

26．You may have noticed that you feel hungry，______you eat three meals a day at regular times．

　 　　　A．as if　　 　　B．but　　 　　C．even when　　 D．even

25．The pollution in this city will _______serious for quite a few years。

　　　 　A．keep　 　　　B. last　 　　　C. remain 　　　D．continue

24．The continuous rain the harvesting of the wheat crop by two weeks．

　 　　　A．set back　　 B. set off　　 C．set aside 　　D．set out

23. They will give the prize money to _____pays enough attention to the protection of wild life．

　 　　　A. who　　 　　　B．anyone　　 　C．whomever 　　D. whoever

22．According to _________World 　Health Organization，Aids is not _____only deadly disease discovered in Africa．

　 　　　A．the；a　　 　B．a；a　　 　　C．the；the 　　D．a；the