67. D depends 68. D adequate 69. A currently 70. C challenges 71. B retirement 72. A over 73. B Learning 74. D on 75. C needs 76. D portion 77. A When 78. A neighbors 79. B ever 80. C In particular 81. C adjust 82. D to 83. B unpredictable 84. C available 85. A sense 86. D roles
