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

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

57. attitude to/ toward …对…的态度.看法

56. 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

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

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

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

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

51. 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);

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