C) being isolated

　　D) having been isolated

　　49. Although they plant trees in this area every year, the tops of some hills are still _______.

　　A) blank

　　B) hollow

　　C) vacant

　　D) bare

　　50. Being a pop star can be quite a hard life, with a lot of travelling _______ heavy schedules.

　　A) with regard to

　　B) as to

　　C) in relation to

　　D) owing to

　　51. Tony is very disappointed _______ the results of the exam.

　　A) with

　　B) for

　　C) toward

　　D) on

　　52. William Penn, the founder of Pennsylvania, _______ defended the right of every citizen to freedom of choice in religion.

　　A) peculiarly

　　B) indifferently

　　C) vigorously

　　D) inevitably

　　53. I hope all the precautions against air pollution, _______ suggested by the local government, will be seriously considered here.

　　A) while

　　B) since

　　C) after

　　D) as

　　54. When people become unemployed, it is _______ which is often worse than lack of wages.

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