52．He 1eft word with his secretary that she should keep it___　　 secret for_____　　　 moment．

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

51. Of all the subjects,I like _________ history best because it gives us_________useful knowledge of things in the past.

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

50.Liu Xiang is_________ first Chinese who has won_________ one-hundred-metre hurdle gold medal in the Olympic Games.

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

49.The report said a car went out of _________control on a highway _________south of the city and rushed into a river.

A.the;the　　　　　　　　　　　 B./;the　　　　　　　　　　　　　 C.the;/　　　　　　 　　　 D./;/

47. -Would you mind giving your advice on how to improve our business management? 　　 -if you make ____ most of the equipment, there will be ____ rise in production. 　　 A. 不填；不填　　 B. the；a　　 C. 不填；a　　 D. the；不填 48.-Did you happen to see _________ black and　 _________ white cat?

-Is she missing?I told you to take care of her.

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

45. Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service. 　　 A. 不填；a　　 B. the；a　　 C. 不填；不填　　 D. the；不填 46. Young as he is, David has gained ____ rich experience in ____ society. 　　 A. the; the　　 B. a; 不填　　 C. 不填；不填　　 D. 不填；the

44.I wonder what it feels like to be one of______really rich. The Jenkinsons already have two Rolls Royces and now they are buying ____ third!

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

43. Many people are still in _____ habit of writing silly things in _____ public places.

A.the;the　　　 B./; /　　 C. the; /　　 D. /; the

42. What ______ public is concerned about is whether medical workers and scientists will be able to find for this new disease in a short time.

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

36. In the market, vegetables are sold by _______ kilogram, I mean, by _______ weight. 　　 A. the; 不填　　　 B.不填; 不填 　　 C. the; the　　　 D.不填；the 37. Many people agree that ______ knowledge of English is a must in _______ international trade today. 　　 A. the, an　　　 B. a, 不填　　　 C. the, the　　 D. 不填, the 38. The cakes are delicious. I’d like to have _______ third one as _______ second one I ate was too small. 　　 A. the, the　　　 B. a, the　　　 C. the, a　　　 D. a, a 39. ________ England of those years was _______ England in peace. 　　 A. 不填, 不填　　　 B. The, an 　　 C. The, 不填　　　 D. 不填, an 40. - Did you happen to see _______ black and _______ white cat? 　　 - Are they missing? I told you to take care of them. 　　 A. a; 不填　　 B. the; 不填　　 C. the; the　　 D. a; the 41. I smoke out of ____ habit, not for ____ pleasure; for I have been in the habit for twenty years.

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