往往要添加上to；第二空中all the valuable things与steal之间为被动关系。

　　3．Armed with the information you have gathered，you can set__about__ preparing your business plan.

　　解析：句意：用你所收集的信息武装自己，你可以准备你的商业计划了。set about doing sth."着手干某事"。

　　4．-I'm sorry，but I didn't mean __to let__ (let) out your secret.

　　-But you know，letting out one's secret means __hurting__ (hurt) one's feelings.

　　解析：第一句句意为"我并不是有意泄露你的秘密"，故用mean to do sth.，第二句句意为"泄露一个人的秘密意味着伤害他"，故用mean doing sth.。

　　5．They were surprised that a child should work out the problem __while__ they themselves couldn't.

　　解析：句意：他们惊奇地发现一个孩子居然解决了这个问题，然而他们却未能做得到。while"(对比两件事物)......而......；......然而......"。

　　6．Most people think that it is worthwhile __to spend/spending__

　　(spend)some time surfing the Internet，but we shouldn't be too dependent on it.

　　解析：It is worthwhile to do.../doing..."做某事是值得的"。句意为：大部分人认为花费一些时间上网是值得的，但是我们不应该太依赖它。

　　7．__Only__ when we lost what we had did we realize how much we loved it.

　　解析："only＋状语从句"位于句首，主句用部分倒装结构。句意为：只有当我们失去了我们所拥有的，我们才意识到我们是多么的爱恋它。

　　8．Seeing the terrible scene，many problems crowded __in__ my head.

　　解析：crowd in one's head"涌入脑海"。句意为：看到那个可怕的场面，很多问题涌入我的脑海。

　　9．The UK promises to reduce its carbon emissions(排放)by 80 percent by 2050，part of which will __be achieved__ (achieve) by all new homes being zero－carbon by 2016.

解析：句意：英国承诺到2050年将碳排放量减少80%，其中一部分是由所