46. We have planned an exciting publicity _______ with our advertisers.

　　A) struggle C) battle

　　B) campaign D) conflict

　　47. _______ the help of their group, we would not have succeeded in the investigation.

　　A) Besides C) But for

　　B) Regardless of D) Despite

　　48. _______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.

　　A) Because C) Since

　　B) For D) While

　　49. John doesn’t believe in _______ medicine; he has some remedies of his own.

　　A) standard C) routine

　　B) regular D) conventional

　　50. Owing to _______ competition among the airlines, travel expenses have been reduced considerably.

　　A) fierce C) eager

　　B) strained D) critical

　　51. They always give the vacant seats to _______ comes first.

　　A) whoever C) who

　　B) whomever D) whom

　　52. In Africa, educational costs are very low for those who are _______ enough to get into universities.

　　A) ambitious C) aggressive

　　B) fortunate D) substantial

　　53. Professor Wang, _______ for his informative lectures, was warmly received by his students.

　　A) knowing C) to be known

　　B) known D) having known

　　54. Our manager is _______ an important customer now and he will be back this afternoon.

　　A) calling on C) calling up

　　B) calling in D) calling for

　　55. A fire engine must have priority as it usually has to deal with some kind of _______.

　　A) precaution C) emergency

　　B) crisis D) urgency

　　56. He said that the driver must have had an accident; otherwise he _______ by then.

　　A) would have arrived C) should arrive

　　B) must have arrived D) would arrive

　　57. The film provides a deep _______ into a wide range of human qualifies and feelings.

　　A) insight C) fancy

　　B) imagination D) outlook