51. arrange for sb./sth. to do sth. 安排…做…

　　52. arrive on 到达; arrive at 到达某地(小地方); 得出，作出; arrive in 到达某地(大地方);

　　53. be ashamed of (=feel shame, guilt or sorrow because of sth. done) 以…为羞耻

　　54. assure sb. of sth. (=try to cause to believe or trust in sth.) 向…保证， 使…确信。

　　55. attach(to) (=to fix, fasten; join) 缚， 系 ,结

　　56. make an attempt at doing sth. (to do sth.) 试图做…

　　57. attend to (=give one's attention, care and thought) 注意，照顾;attend on(upon)(=wait upon, serve, look after) 侍候，照料

　　58. attitude to/ toward 。。。对。。。的态度、看法

　　59. attribute…to…(=to believe sth. to be the result of…)把。。。归因于。。。, 认为。。。是。。。的结果

　　60. on the average (=on average, on an average) 平均