39. ask for 要求

40. attach importance to 重視

41. pay attention to重視catch one's attention引起…注意/重視

42. available可得/買到的

There is no ticket available.

43.average平均on（the） ~

44. be aware of = realize意識到be sure一定要，肯定

He apologized to us for the mistake as soon as he was aware of it.

Be sure not to be late for the meeting.

I'm sure the play will be a great success.

45. back up支持

46. background背景

47. base ~…on…把…建立在…基礎(chǔ)之上

His article is based on the research.

48. bear忍受，容忍同義詞：

endure tolerate stand put up with

She cannot bear to see the child in pains.

49. do/try one's best

He said he would try his best to carry out the plan.

50. because連詞：There will be no meeting because the manager will be on the vacation next week.

because of介詞：His wedding will be put off because of his father's death.

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