86. 作为一名高三学生，我已经习惯于刻苦学习。(accustom)

70. A. can be B. can't be C. can have been D. can't have been

69. A. probably B. really C. completely D. possibly

68. A. before B. later C. ahead D. behind

67. A. ancient B. important C. Olympic D. Olympics

66. A. a B. the C. no D. /

65. A. longer B. shorter C. happier D. stronger

64. A. together B. differently C. altogether D. purposely