none left.

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　　答案：run→running　当主语是物时，run out是不及物动词，表示"耗尽"，没有被动语态，应改为进行时，表示即将耗尽。

　　3．With more and more trees cutting down, some animals are facing the danger of dying out.

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　　答案：cutting→cut　cut down和trees之间构成逻辑上的动宾关系，故应用过去分词作with复合结构中的宾语补足语。

　　4．The baby can't even sit up yet, let out walk!

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　　答案：out→alone　let out通常意为"发出(大的声音)"；let alone常用在否定句中，意为"更不用说"，根据语境，应改out为alone。

　　5．I try to make what I want to say easy accepted by children.

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　　答案：easy→easily　修饰动词accept应用副词形式，故将easy改为easily。

　　Ⅲ.语法填空

　　Have you ever heard that we humans use only ten percent of our brains? This myth holds __1__ certain appeal because if it __2__ (be) true, then we could instantly become ten times __3__ (intelligent) just by firing up that sleepy majority of the brain!

　　The idea that we use only a small fraction of the brain dates back to animal experiments in the 19th century. When scientists __4__ (stimulate) a specific part of the brain, the animal moved __5__ (it) leg or tail. And some scientists assumed that large parts of the brain were simply useless.

　　Then, in the early 20th century, scientists observed that stimulating certain regions of the brain had no physical effects, which __6__ (call) the "silent cortex". Today we know that much of the "silent cortex" is actually devoted to complex activities like language, learning and imagining.

　　Actually, __7__ we sleep, many areas of the brain are extremely active. Would you be smarter if your entire brain constantly worked to maximum capacity? __8__ (interest) enough, the opposite is probably true. The less brain activity you need to perform a __9__ (give) task, the more the brain as a whole is capable __10__ doing.

　　1．________ 　2.________ 　3.________ 　4.________ 　

　　5.________ 　6.________ 　7.________ 　8.________ 　

　　9.________ 　10.________

　　篇章导读：本文是一篇说明文。我们人类只使用了大脑的百分之十？是否激活沉睡的大部分大脑我们就可以比现在聪明十倍？很遗憾，科学证明事实并不是这样的！

　　1．a　考查冠词。hold a certain appeal "有一些吸引力"。

2．were　考查虚拟语气。根据空格后的"then we could instantly become ..."可知，此处是与