答案：B 考查连词的用法。句意：吃得更好，多锻炼以及有足够的睡眠，这些我们都知道，但是做起来很困难，即使我们知道应该这样做。because“因为”；even though/even if“即使；虽然”；as if“好像”；when“当 的时候”。
10．—What would you do if it________tomorrow?
—We have to carry it on, since we've got everything ready.
A．rain B．rains
C．will rain D．is raining
答案：B 本题考查的是条件状语从句中的时态。句子意思是“如果明天下雨，你打算做什么？”所以从句谓语应该用一般将来时，在条件状语从句中要用一般现在时表示一般将来时，所以此题答案应选B项。
11．It is known to all that________you exercise regularly, you won't keep good health.
A．unless B．whenever
C．although D．if
答案：A 本题的意思是“人们都知道，除非你经常锻炼，否则你不会保持健康。”，选项B的意思是“无论何时”；选项C的意思是“尽管”；选项D的意思是“如果”。显然都不符合句意，此题的答案应该选择A项。
12．Visitors________not to touch the exhibits.
A．will request B．request
C．are requesting D．are requested
答案：D 本题考查的是被动语态以及request的用法。句意为“参观者被要求禁止触摸展品”，request是及物动词，根据句子的意思“游客被要求 ”可知要用被动语态，故答案应选D项。
13．The research is so designed that once________nothing can be done to change it.
A．begins B．having begun
C．beginning D．begun
答案：D 本题考查的是在状语从句中的省略情况。once引导的是一个条件状语从句。当从句主语与主句主语一致，从句中谓语是be或者从句主语是it，谓语是be的时候，可以将从句中的主语与be一起省略。D项省略了it is，所以此题应选择D项。
14．________much advice I gave him, he did exactly what he wanted to do.
A．How B．Whatever
C．However D．No matter
答案：C however引导让步状语从句。however后接形容词或副词。“无论给他多少劝告，他都完全按他所想的去做。”how不能引导让步状语从句，只能引导名词性从句。
15．I would appreciate it________you call back this afternoon for the doctor's appointment.
A．until B．if
C．when D．that
答案：B if引导条件状语从句，“如果你今天下午对与医生的约会打电话回来，我会非常感谢。”
Ⅱ.完形填空
One summer day my father sent me to buy wire for our farm. At 16, I like__1__better than driving our truck, __2__this time I was not happy. My father had told me I'd have to ask for credit(赊账)at the store.
Sixteen is a__3__age，when a young man wants respect, not charity. It was 1976, and the ugly__4__of racial discrimination was__5__a fact of life. I'd seen my friends ask for credit and then stand, head down, while the store owner__6__whether they were“good for it.” I knew black youths just like me who were__7__like thieves by the store clerk each time they went into a grocery.
My family was__8__. We paid our debts. But before harvest, cash was short. Would