54. A. smoke B. drink C. fight D. work
53. A. before B. if C. whether D. though
52. A. play B. change C. study D. meet
51. A. still B. nerver C. sometimes D. already
50. A. books B. teachers C. food D. money
49. A. worry about B. pay for C. ask for D. think of
48. A. Serveral B. Most C. A few D. Few
47. A. leave B. enter C. reach D. pass
46. A. and B. so C. till D. since
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