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53.A　 keep one's mind on sth專心做某事;keep sth in mind記住某事。

53.---Tom, keep your_____ on your studies.

　　 --- Sure, mum. I'll keep that in_____.

A. mind;mind　 B.heart;headC. brain; mind D.heart;brain

52.D course在此意為“(一)道(菜)”，“(一)盤(菜)”。

52. ---What do you think of the dinner in Mr Brown's?

---Oh, great! We have never had a better one. It's a dinner of twenty ____.

A. drinks　　 B. people　 C. tables　 D. courses

51.B wooden作定語，意為“用木頭(塊)制成的”，wood作定語，意為“就木頭本身制成的”。從該題題干可看出，在木頭上雕刻各種花樣，應為wood carving。

51. His job is to sell the ____ carvings in the ____ department of the company.

A. wooden; sales B. wood; salesC. wood; saleD. wooden; sale

50.C 考名詞辨異。A、B、D三個選項都是不可數名詞，不可與a single連用。

50.1 haven't got a single ______from Aunt Mary since I last saw her.

A. advice　 B. news　 C. message　 D. information

49. sign與mark的區別是：sign 的意思是“跡象”、“征兆”gesture or movement made with the hand, head, etc, used to give information, a command, etc(用手或頭等做出示意動作以傳遞信息或命令等)，mark 的意思是 written or printed symbol or figure, line etc made as signor an indication of sth(書寫與印刷的符號或圖、線等記號)。根據此二詞的語義區別以及常識可知

48. 本題中的and連接前后兩個what引導的從句，而且根據句意“他說的和他做的不一樣”，可見這兩個what從句的意思是各自獨立的，因此謂語動詞用復數形式。