71. make the best of尽量利用;善用
72. had better do sth。最好做某事
73. better off 小康
74. a bit of 有点儿
75. be to blame应受谴责
76. blame sb for sth。责备某人某事
77. borrow sth from sb。向某人借某物
78. both…and …两者都…
79. at the bottom of 在…底部
80. break down 出毛病， 抛锚
81. break out 爆发
82. break away from 脱离;摆脱
83. break up分裂 结束;解散
84. break into闯入， 打断
85. at breakfast 早饭时
86. have breakfast 吃早饭
87. hold one's breath 屏住气
88. out of breath 上气不接下气
89. take breath歇息
90. take one's breath away目瞪口呆;大为惊讶
91. waste one's breath白费口舌
92. burst out迸发;突然…起来
93. burst into tears突然大哭
94. go to 地点 on business 出差
95. be busy doing sth。忙于做某事
96. be busy with sth。忙于做某事
97. but for要不是
98. by bus/car/plane/train/ship/air 乘 ……
99. by and by 不久以后;
100. call for 请求