11.__________is well known, light, like heat, is a form of energy.

　　A.It　　B.what　　C.Just as　　D.As

　　答案：D

　　解析：众所周知，光，跟热一样，是能量的一种形式。这是一个由as引导的定语从句。

　　12.They are__________ students that they all performed well in the nationwide examinations.

　　A.so diligent　　B.such diligent　　C.so much diligent 　　D.such very diligent

　　答案：B他们都是如此用功的学生，在全国统考中都取得了好的成绩。我们注意这两个句式的区别：so+形容词+a/an+可数名词单数;such+a/an+形容词+可数名词单数(such+形容词+可数名词复数)，这里要修饰的学生是复数，所以用such diligent.

　　13.It was because it rained heavily last night __________he didn't come to the evening school.

　　A.that 　　B.so that　　C.so　　D.when

　　答案：A昨天晚上雨下得太大了，所以他没有来夜校。强调句型，强调原因。

　　14.Air, or__________ is called atmosphere, surrounds the whole earth.

　　A.it　　B.that　　C.which　　D.what

　　答案：D空气，或者说是我们所称的太空，环绕着地球。这是一个同位语从句，what引导的同位语从句在句子中充当主语的成分。

　　15.Nowhere else in the world __________ more attractive scenery than in Switzerland.

　　A.you can find　　B.is found　　C.can you find　　D.has been found

　　答案：C世界上没有什么地方能找到比起新西兰更加迷人的风光。nowhere位于句首，句子倒装，句子中的情态动词提到主语前构成倒装。

　　16.I couldn't find Peter, __________did I know where he had gone.

　　A.never　　B.either　　C.nor　　D.as

　　答案：C我找不到彼特，也不知道他去哪儿了。两个动作都发生，用nor(也…);另外nor位于句首时，句子要倒装，情态动词或助动词要提到主语前构成倒装句式。

　　17.__________the importance of wearing seat belts while driving.

　　A.Little they realize　　B.They little do realize　　C.Little realize do they　　D.Little do they realize

　　答案：D驾驶的时候，他们没有意识到系上安全带的重要性。表否定的词little位于句首时，句子倒装。

　　18.Our society has changed and __________ in it.

　　A.so the people have　　B.the people have so　　C.so have the people　　D.have the people so

　　答案：C社会发生了变化，其中人也如此。so…也…;so后面跟表示肯定的句子，表示与前面相同的情况，其后的句子要倒装。

　　19.__________, none of us wanted to take a rest.

　　A.Tired although we were 　　B.Tired as we were　　C.As we were tired 　　D.We as were tired

　　答案：B尽管很累了，我们中没有一个人想休息会儿。fits引导的让步状语，必须采用两种语序：(1)表语+as+主语+谓语;(2)状语+as+主语+谓语。

　　20.She opened the door quietly __________ wake up her sleeping baby.

　　A.in order that　　B.so that　　C.in order to　　 D.so as not to

　　答案：D她轻轻地把门打开，以免把她熟睡的婴儿惊醒。so as to的否定形式为：so as not to，前三个选项句意显然不符。