答案：去掉which或which→that或which前加in　the way作先行词，且在定语从句中作状语时，其引导词有三种形式：that/in which或省略。

　　4．Helene did not want her daughters to always work in the family business because of she thought it was too hard.

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　　答案：去掉of　because引导原因状语从句。because of后接名词(短语)、代词或宾语从句。

　　5．The manager gave his command that measures were taken immediately to correct all the mistakes made in marketing.

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　　答案：were→be　that引导的是同位语从句，解释说明command的具体内容，其从句中的谓语动词应使用 "should＋动词原形"的结构，并且should可省略。

　　Ⅲ.语法填空

　　There's no such thing __1__ living alone. Never mind if you're the only person in your house and have no dog, no cat, or even no fish. You still have got several billion __2__ (roommate) and so do we all. Some of them are harmless, some are __3__ (actual) helpful and some could even kill you. They are, of course, bacteria, fungi (霉菌) and viruses, and whether you like it or not, they're on you, around you, and deeply within you. The fact __4__ bacteria are everywhere is not surprising. It's something you __5__ (learn) from your childhood when your mother told you not to drink water from someone else's glass. There are lots of bacteria __6__ are living in your tea kettle. There are bacteria __7__ (sleep) with you on your bed. Scientists are beginning __8__ (realize) the richness of the microbiome (微生物群系), which is as complex as the ones __9__ (find) in oceans, rainforests, deserts and woodlands. Your house has a microbiome and __10__ do you.

　　1．________　2.________　3.________　4.________　5.________　6.________　7.________　8.________　9.________　10.________

　　篇章导读：本文是一篇说明文。世上没有真正独自的生活，即使你单独在家，家里没有狗、猫或者鱼，你身边还是有成千上万的陪伴者--各种细菌、霉菌和病毒。

　　1．as　考查固定结构。There is no such thing as ... "没有像......这样的事"。

　　2．roommates　考查名词的复数。roommate为可数名词，由several billion可知，应用复数形式。

　　3．actually　考查词性转换。此处应用副词修饰形容词helpful。

　　4．that　考查同位语从句的连接词。根据语境可知，本句中含有由that引导的同位语从句，解释说明The fact的具体内容。

　　5．learned/learnt　考查动词的时态。根据下文中的told可知，应用一般过去时。

　　6．which/that　考查定语从句的引导词。分析句子结构可知，空处引导定语从句，先行词为bacteria，指物，关系词在从句中作主语，故用which或that。

　　7．sleeping　考查非谓语动词。bacteria与sleep存在逻辑上的主谓关系，故用现在分词作后置定语。

　　8．to realize　考查非谓语动词。start和begin后跟表示心理状态或精神活动的动词时，如understand和realize等，常用不定式。

9．found　考查非谓语动词。the ones与find是被动关系，应用过去分词作后置定语。