解析：参考解析:动词时态。根据时间状语By the end of this year可以判断时间是将来，应该从C项和D项做出选择。同时，by引导时间状语时，句子时态一般是完成时态，所以选D。其他选项的时态都不可以与时间状语by the end of this year连用。句意:到今年年底，斯密斯先生在我们公司工作正好3年。本解析在2008年12月的试题中(Structure: Section 20)已经出现过，望考生加以注意。

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He traveled to the Northern part of the country, ________he got many new ideas for this book.

A. which

B. there

C. where

D. that

解析：参考解析:此处是一个非限制性定语从句，缺状语，选项中只有where能作状语，故选C。

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No matter who he is, young or old, people＇s state of mind tends to keep _________ with the rapid change of society.

A. contact

B. progress

C. touch

D. pace

解析：参考解析:译文:无论老少，人们的想法都能与时俱进。考点:动词短语。解析:选项A与keep..with搭配时应为keep in contact with。选项B无法与keep...with搭配。选项C，keep touch with意为与...保持联系。只有keep pace with符合题意，意为”与...并驾齐驱”。

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I can＇t find the key to my office. I ________ have lost it on my way home.

A. would

B. should

C. must

D. ought to

解析：参考解析:本题考查情态动词。情态动词must + have done，用来表示对过去发生事情的肯定推测，意思为"肯定做过某事”。正确答案为C。句意:我找不到办公室的钥匙，肯定是丢在回家的路上了。

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We don＇ t allow _________ in the meeting room.

A. to smoke

B. smoked

C. smoking

D. to smoking

解析：参考解析: allow+动名词doing或者allow+sb.+to do sth.为固定搭配，都表示"允许做某事”，故选C。

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Anderson is one of those ________ appear friendly but in fact are hard to deal with.

A. who

B. they

C. that

D. which

解析：参考解析:这里需要一个表示人的关系代词，四个词中，只有who最合适。故选A。句意:安德森是那些看起来很友好但实际上很难相处的人之一。

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I＇m sorry to have taken up too much of your _______ time.

A. valuable

B. valueless

C. priceless

D. worthy

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I was almost asleep last night when I suddenly heard someone _________ at the door.

A. be knocking

B. knocking

C. to knock

D. having knocked

解析：参考解析:感官动词。感官动词比如see、watch、hear后面接动词的ing形式，表示某种动作正在进行。也可以加动词原型表示动作的整个过程。此题是说正要睡着的时候突然听到有人敲门，表示的应该是正在进行的动作，所以应该是进行时态。故B为答案。A项是现在进行时的形式，没有这种用法。C项不定式不能放在感官动词后面。D项现在完成进行时也不能放在感官东西后面使用。句意:昨晚我快睡着的时候突然听到有人敲门。

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l speak in full ________ that our cause is just.

A. conclusion

B. assumption

C. conviction

D. determination

解析：参考解析: 题目意思:我深信我们的诉讼是合理的。conviction. 1.确信,坚定的信仰,坚定的看法(或信念)2.判罪;定罪;证明有罪 3.深信;坚信;坚定;肯定

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_________ his appearance, he comes from a well-off family.

A. Judged from

B. To judge from

C. Judging from