43. The Olympic Games ____held every ____years.

　　 A.　　 is； four　　 B. are； four　　 C. is； five　　 D. are； five

42. Where ____rubbish， there are flies.

　　 A.　　 there are　　 B. there is　　　 C. is　　　　 D. there has

41. Your trousers ____dirty， you must have _____washed.

　　 A.　　 is； it　　　 B. are； it　　　 C. are； them　　 D. is； them

40. Apples of this kind ____.

　　 A.　　 tastes good　 B. tastes well　 　 　　 C. taste good　　 D. taste well

39. The police ____the murderer everywhere when he suddenly appeared in a theatre.

　　 A.　　 is searching for　　　 B. were searching for

　　 C. are searching for　　 D. were searching

38. John has two brothers， but either ____out of work now.

　　 A.　　 are　　　　 B. is　　　　 C. has　　　　 D. have

37. ____can be done _____been done.

　　 A.　　 All； have　 B. All that； have　 　　 C. All； has　 D. All that； has

36. The Chinese people _____hard-working and brave.

　　 A.　　 are　　 B. is　　 C. has been　 D. are being

35. Nobody ____to smoke in the cinema.

　　 A.　　 allows　　 B. allow　　 C. is allowed　　 D. are allowed

34. The air in big cities _____very dirty by factories.

　　 A.　　 are often made　　　　 B. is often made

　　 C. have often made　　　 D. has often made