23 What does the author mean by saying“the boy who has the genius ... try his hand at the
broom”(Lines6-8,Paragraph 1)?

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.

46. It is understandable that the health and Vy welfare of their family is an ( )concern for this young couple.

45. The movie presents Lincoln as a strong-willed, ( )man who led the US through a moral, constitutional and political crisis.