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