写出下面句子括号中所给词的正确形式。 41. We’ll make it before the clock_________(敲击) nine. 42. Welcome to drop in if i

写出下面句子括号中所给词的正确形式。
41. We’ll make it before the clock_________(敲击) nine.
42. Welcome to drop in if it is __________(方便的) to you.
43. If you have any questions, don’t_________(犹豫) to ask me.
44. Books in the library are often _________(分类) according to subjects.
45. Fifteen people were under _________(逮捕) because of serious violence.
46. With China’s economy_________(繁荣), the country becomes powerful.
47. The_________(大多数) of his income is spent on his house every month.
48. He forgot to turn the _______(水龙头) off, and the water is running all over.
49. He could have finished it on time, but ________(不知怎么地) he fell behind.
50. I tried all means to look for my keys, but everything was in _______(徒劳).
【答案】41. strikes    
42. convenient    
43. hesitate    
44. classified/sorted    
45. arrest    46. booming    
47. majority    
48. tap    49. somehow    
50. vain
【解析】
【41题详解】
考查动词。句意：我们会在钟敲九点前赶到的。根据句意及汉语提示可知，此处是动词strike，时间状语从句中一般时态表将来，主语是the clock，谓语动词使用第三人称单数形式。故填strikes。
【42题详解】