51.When you have finished with that book, don’t forget to put it back on the shelf,（ ）?

49.Issues of price, place, promotion, and product are（ ）conventional concerns in planning marketing strategies.

48.The Minister of Finance is believed（ ）of imposing new taxes to raise extra revenue.

47.The less the surface of the ground yields to the weight of a fully-loaded truck,（ ）to the truck.

46.It is imperative that students（ ）their term papers on time.

45.If not（ ）with the respect he feels due to him, Jack gets very ill-tempered and grumbles all the time.

44.（ ）if I had arrived yesterday without letting you know beforehand?

43.The government has promised to do（ ）lies in its power to ease the hardships of the victims in the flood-stricken area.

42.（ ）, I’ll marry him all the same.

41.That trumpet player was certainly loud. But I wasn’t bothered by his loudness （ ）by his lack of talent.

65.I think you can take a(n)（ ）language course to improve your English.