21 What can be inferred from the passage about success?

56. Located in the heart of the city, the Dogs' Home is open seven days a week, 365 days a year to receive ( )dogs.

55. Much of the city was ( )before the storm but thousands remained, many of whom were trapped by the water for days.

54.The neighboring country suddenly concentrated a large number of soldiers and armaments on the border,ready for military actions. ( ) the pretext of holding training exercises.

53. Whenever I played hide-and-go-seek, it would ultimately end ( )me turning myself in.

52. Sports activities can offer challenge and excitement in the lives of patients who might otherwise become bored and tempted to revert ( ) bad habits.

51. The financial stress felt by students is strongly related ( )the fact that tuition fees are constantly rising,causing worries about the affordability of higher education.

50. The book is technical and detailed, but, if you are prepared to put effort ( ) understanding it, this book should interest you very much.

49. After graduating from college three years ago, he moved to New York City and established himself ( )a successful composer.

48.We should try our best to preserve our natural land so that future generations may also truly immerse themselves( )the experience of its natural beauty.

47. Of course, there will be people you can call on for help from time to time, but basically you are ( )your own, and you have to develop an inner source of strength and self-reliance that you may not feel.