53.------Look at the heavy rain._____it would stop!

------Yes,it’s been like this for a whole day.

A.Even if　 　　　　　B.Only if 　　　　　　C.As if　 　　　　　D.If only

52.The 2008 Olympic Games,_____in Beijing,are expected to be a great success.

A.held　　　　　　　 B.to be held　　　　 C.being held　　　 D.to hold

51.I would most love you _____the party yesterday,but you had to work extra hours.

A.to attend　　　　 B.attending　　　　　 C.to have attended D.having attended

50.-----We really appreciate you inviting us to such a super fulvous dinner.

------________

A.Don’t mention that　　　　　　　　　　 B.With great pleasure　

C.We are glad you have come　　　　　　　 D.hope you enjoyed yourself.

49.I don’t really think he has kicked off his bad habits;he_____.

A.just smoked　　　 B.was just smoking　 C.did smoke　　　 D.had just smoked

48._____himself in thought,he almost ran into the car in front of him.

A.Lost　　　　　　 B.Losing　　　　　　　 C.having lost　　 D.having been lost

47.You had best check that the soft disk works perfectly____you copy any file.

A.unless　　　　　 B.since　　　　　　　 C.while　　　　　 D.before　

46.We can settle ____difficult problems if united rather than divided.

A.some　　　　　　 B. so　　　　　　　　 C.however　　　　 D.whatever

45.I think travel____my knowledge of the world,so I enjoy it very much.

A.improves　　　　 B.provides　　　　　　 C.raises　　　　 　D.increases

44.______aging of the population will affect ______American society in many ways____education,medicine,and business.

A.The;/　 　　　　　B.The;the　 　　　　　　C.An;/　 　　　　　D.An;the