41. They ________ to enter the building by the back door; however, the front door was locked.

　　A) weren’t supposed B) wouldn’t be supposed

　　C) were supposed D) would be supposed

　　42. ________ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.

　　A) Deliberate B) Consistent

　　C) Primitive D) Abnormal

　　43. The captured criminals were ________ in chains through the streets.

　　A) exhibited

　　B) displayed

　　C) paraded

　　D) revealed

　　44. In reading stories we anticipate what is to come ________ on our memory of what has gone before.

　　A) based

　　B) basing

　　C) to base

　　D) to be based

　　45. The world’s governments have done ________ nothing to combat the threat of nuclear accidents.

　　A) inherently

　　B) vitally

　　C) virtually

　　D) identically

　　46. I guess Jones didn’t have a chance to win the election. Almost all of the people in the city voted for his ________.

　　A) candidate

　　B) opponent

　　C) alternative

　　D) participant

　　47. The background music in an assembly line is designed ________.

　　A) not being listened to

　　B) not to be listened to

　　C) being not listened to

　　D) to be not listened to

　　48. Teaching students of threshold level is hard work but the effort is very ________.

　　A) precious

　　B) rewarding

　　C) worth

　　D) challenging

　　49. The boy students in this school are nearly ________ as the girl students to say they intend to get a college degree in business.

　　A) as likely twice

　　B) likely as twice

　　C) as twice likely

　　D) twice as likely

　　50. The explorer lost his way so he climbed to the top of the hill to ________ himself.

　　A) spot

　　B) locate

　　C) place

　　D) situate

　　41. A 42. D 43. C 44. A 45. C

　　46. B 47. C 48. B 49. D 50. B