81.on board 到船上，在船上，上火车或飞机
82.boast of(or about)吹嘘
83.out of breath 喘不过气来
84.in brief(=in as few words as possible)简言之
85.in bulk 成批地，不散装的
86.take the floor 起立发言
87.on business 出差办事.
88.be busy with sth.于某事;be busy doing sth. 忙于做某事
89.last but one 倒数第二
90.but for(=without)要不是，表示假设
91.buy sth. for…money 用多少钱买
92.be capable of能够，有能力;be capable of being+过去分词是能够被…的
93.in any case(=for love or money，at any rate，at any price，at any cost ，whatever happens;anyhow)无论如何
94.in case(=for fear that)万一
95.in case of(=in the event of)如果发生…万一;in the case of 至于…，就…而言
96.in no case 在任何情况下都不(放句首倒装句)
97.be cautious of 谨防
98.center one's attention on(=focus one's attention on)把某人的注意力集中在…上
99.be certain of(=be sure of)有把握，一定.
100.for certain of(=for sure)肯定地，有把握地
