4.　　　 Be patient! Mrs Jones will be back s___________.

3.　　　 Scientists have made a major ___________ (突破) in the treatment of cancer.

2.　　　 Radio, television, newspapers and magazines are known as the mass ___________ (媒体).

1.　　　 That man may be in his 30s. It is difficult to tell his e___________ age.

50. I ________ suggested you should do it again; there is no need to get annoyed.

　　 A. even　　　　　　　 B. still　　　　　　　　　 C. yet　　　　　　　　　　　　　 D. merely

49. He ________ to improve the working arrangements.

　　 A. forbade　　　　　 B. undertook　　　　 C. objected　　　　　　　　 D. bothered

48. His voice is ________ enough to be heard all over the hall.

　　 A. aloud　　　　　　　 B. loudly　　　　 C. loud　　　　　　　　　　　　 D. high

47. His novel has ________ him such a reputation.

　 A. earned　　　　　　 B. won 　　　　　　　 C. obtained　　　　　　　　 D. acquired

46. Cloning an animal is a complex ________ that can go fatally wrong at any stage.

　　 A. process　　　　　 B. regulation　　　　 C. step　　　　　　　　　　　　 D. method

45. ________ is as much an art as it is ________ science.

　 A. Cloning; a B. Clone; / 　　　　　 C. To clone; the 　　　　 　D. Cloning; the