41. In order to make things convenient for the people, the department is planning to set up some ______ shops in the residential area.

　　A) flowing C) mobile

　　B) drifting D) unstable

　　42. Mr. Smith says: "The media are very good at sensing a mood and then ______ it."

　　A) overtaking C) widening

　　B) enlarging D) exaggerating

　　43. This is not an economical way to get more water; ______ , it is very expensive.

　　A) on the other hand C) in short

　　B) on the contrary D) or else

　　44. It was the first time that such a ______ had to be taken at a British nuclear power station.

　　A) presentation C) preparation

　　B) precaution D) prediction

　　45. ______ that he wasn't happy with the arrangements, I tried to book a different hotel.

　　A) Perceiving C) Puzzling

　　B) Penetrating D) Preserving

　　46. The board of the company has decided to ______ its operations to include all aspects of the clothing business.

　　A) multiply C) expand

　　B) lengthen D) stretch

　　47. His business was very successful, but it was at the ______ of his. family life.

　　A) consumption C) exhaustion

　　B) credit D) expense

　　48. First published in 1927, the charts remain an ______ source for researchers.

　　A) identical C) intelligent

　　B) indispensable D) inevitable

　　49. Joe is not good at sports, but when it ______ mathematics, he is the 'best in the class.

　　A) comes to C) comes on to

　　B) comes up to D) comes around to

　　50. Doctors warned against chewing tobacco as a ______ for smoking.

　　A) relief C) substitute

　　B) revival D) succession

　　51. When carbon is added to iron in proper ______ the result is steel.

　　A) rates C) proportions

　　B) thicknesses D) densities

　　52. You should try to ______ your ambition and be more realistic.

　　A) reserve C) retain

　　B) restrain D) replace