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。
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