59. A. why B. so C. because D. though
58. A. but B. and C. still D. even
57. A. before B. behind C. after D. in the front of
56. A. working on B. working out C. thinking about D. understanding
55. A. important B. more important C. less important D. too important
54. A. outside B. out C. for D. at
53. A. learning B. learned C. to learn D. learn
52. A. something B. anything C. nothing D. everything