英语高手请进！语法选择题(红本真题二)，谢谢解答！

首先在这里先说明一下情况，因为我的错题是考试的历年真题来的。同时这次的考试对我来说很重要，希望各位前辈能够帮助我，谨慎作答，因为我会完全相信你们的答案的！谢谢！（题目比较多，如果越详细，解释越明白。我会最后提高财富值的）谢谢！

1.Same warned that the step the US government has taken to cope with the current crisis is ______much risk.
A.one of B. the one of C. the one D. that one
--我选了D，答案选A

2.The current situation urged that more attention________to problems less studied by the city govetnment.
A. be given B. should give C. paid D. should pay
--我选了D，答案选A

3.It was quite some time______the president managed to save his firm from near bankruptcy.
A,until B. when C. that D. before
--我选了C，答案选D
（记得翻译一下）
4. The Olympic Games can_____its history back to 776 B.C.
A.follow B. track C.trace D. chase
--我选了A，答案选C

5.We are busy reviewing our lessons because the final examination is ______.
A.be round the corner B. at the corner
C. in the corner D. on the corner
--我选了A，但不知道为什么

Same warned that the step the US government has taken to cope with the current crisis is ______much risk.
答案A.one of   代替 上文提到的可数名词单数  the step这是类指  æ‰€ä»¥å‰é¢ä¸èƒ½åŠ é™å®šè¯ 

of much risk作定语修饰 one

2.The current situation urged that more attention________to problems less studied by the city govetnment.
答案A. be given   这是省略should 的虚拟语气  
-选项D语态不对，

3.It was quite some time______the president managed to save his firm from near bankruptcy.
答案D. before 这是典型的before 句型 

句子意思   相当一段时间之后， 头 才把他的公司 从频临破产中 挽救过来
--选项C错的离谱 

4. The Olympic Games can_____its history back to 776 B.C.
答案  C.trace  è¿½æœ”   追朔    æ ¹æ® 句子意思 决定    

5.We are busy reviewing our lessons because the final examination is ______.
A. round the corner   即将来临  

不好意思，这么久才来追问：第一题不太懂。

one of = a step of
也就是 the step is a step of much risk.这个步骤是一个非常冒险的步骤