49. A. ordinary B. rare C. modern D. popular
48. A. by B. in C. with D. of
47. A. created B. published C. did D. discovered
46. A. use B. origin C. expression D. meaning
45. A. hardware B. software C. operator D. speaker
44. A. Therefore B. Though C. However D. Anyhow
43. A. lots of B. plenty of C. lot of D. sort of
42. A. widely B. hardly C. seldom D. deeply
41. A. containing B. printing C. publishing D. expressing
40. A. job B. research C. survey D. search