46. (be) aware of (=be conscious of , having knowledge or consciousness)意识到,知道.

He is not aware of his danger. 他没有意识到自己有危险。

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

On the average, there are 300 tourists a week. 每星期平均有300游客。

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

They attribute their success to their teacher’s encouragement. 他们把成功归因于老师的鼓励。

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

Before they fled the country, the enemy vainly made at attempted at destroying all the factories. 敌人在逃往国外前，妄图把所有工厂都毁掉。

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

We book early to assure ourselves of seats. 我们及早订票以确保有座。

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

You should be ashamed of what you have done. 你应为自己所做的事感到羞愧。

40. 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);

You must arrive at the airport two hours early. 你必须提前两小时到达机场。

Flight number BA 4793 will arrive in London at 16:50. 英国航空公司4793号班机于16时50分抵达伦敦.

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

If you can arrange for me, I will be very grateful. 如果你能为我安排一下，我将不胜感激。

38. arise from(=be caused by) 由……引起。

Accidents arise from carelessness. 意外事故起因于粗心大意。

37. approve of (=consent to, be in favor of, favor, agree to, consider good, right) 赞成, approve vt. 批准

He do not approve of our plan. 他不赞成我们的计划。

Her father will never approve of her marriage to you. 她父亲永远不会同意她和你结婚。