46. Mr. Ray regrets that he will have to__________your kind invitation because of a prior engagement.

　　A. refuse B. reject C. decline D. recline

　　47. When dawn__________, they were still 150 miles from New York.

　　A. started B. began C. arrived D. broke

　　48. People should save money as a __________ against unemployment.

　　A. cushion B. caution D. protection D. shelter

　　49. Public opinion was deeply __________ over the project.

　　A. different B. disagreed C. disagreeable D. divided

　　50. He was apparently planning to rent a car and drive __________ to Los Angeles.

　　A. directly B. direct C. straight D. straightly

　　51. You may use the notebook as you like, __________ you keep it clean.

　　A. as far as B. so long as C. as further as D. so far as

　　52. I do not know how the family manages to live __________ 50 yuan a week.

　　A. with B. by C. on D. for

　　53. She thinks it will rain this afternoon, but her father thinks __________.

　　A. likewise B. anywise C. otherwise D. as well

　　54. He has finally achieved the status he so __________.

　　A. desired B. wished C. hoped D. longed

　　55. There was only about five minutes__________ of the lecture.

　　A. leaving B. left C. having left D. having been left