51 at first 首先,开始的时候;
52 at large未被捕获的,大多数;
53 at last 终于，最终;
54 at least至少
55 at length 最终,详细地;
56 at most最多
57 at no time从不，决不
58 at one time曾经，从前曾
59 at the cost of以……为代价
60 at the least 至少;
61 at times有时,间或;
62 at…speed以……的速度
63 attend on 照顾，侍候;
64 attribute … to 把……归于
65 back up 后退，支持;
66 base on 基于
67 be able to能够，胜任
68 be about to正打算
69 be accustomed to习惯于
70 be associated with 与……有关，与……有关系
71 be aware of 意识到;
72 be capable of 有能力干;
73 be caught 遇到，陷入
74 be committed to被交给┄,答应承担┄义务;
75 be confined to 限制在,局限于;
76 be confined/be restricted受……限制
77 be dedicated to 奉献,献给;
78 be devoted to 被用于，贡献给
79 be directed to指向，针对
80 be drawn to 被┄所吸引;
81 be due to由于，因此
82 be exposed to 暴露在┄下,处在┄的作用之下;
83 be fond of 喜爱
84 be full of 充满他
85 be habitual to(him) 对(他来说)习以为常
86 be in order合适，恰当。
87 be involved in 参与，参加;
88 be involved with 与……有关连，
89 be left to 由┄来决定,由┄来想办法;
90 be limited to限制在┄,限定在┄;
91 be linked to/with something 与……连接
92 be proud of 为~而骄傲。
93 be referred to被提及，被提交
94 be related to与……有关
95 be sick of 厌恶┄,讨厌┄;
96 be subject to 经受,遭受;
97 be suitable for适合于
98 be sure of 对┄的肯定;
99 be thrown in 额外赠送
100 be tied by/with被……捆绑
