C．concern D．relationship

答案　A

解析　考查名词词义辨析。tradition惯例，常规，传统；balance平衡；concern担心，焦虑；relationship关系。句意为：我们办公室有个惯例，那就是每逢谁过生日的时候他们都会带来蛋糕给大家分享。这里说的是办公室的习惯做法，故tradition符合语境。

7．He felt ________as soon as he realized that he had asked a foolish question.

A．bored B．displeased

C．embarrassed D．disappointed

答案　C

解析　句意为：他一意识到自己问了一个愚蠢的问题就感到尴尬。根据句意可知选embarrassed尴尬的，困窘的。

8．At times the balance in nature is________，resulting in a number of possibly unforeseen results.

C．disturbed D．puzzled

答案　C

解析　句意为：自然界的平衡有时被打破，产生了许多不可预见的后果。disturb弄乱，打扰；trouble麻烦，烦扰；confuse使困惑；puzzle使迷惑。

9．People from the West like to use "please" and "thank you" in cases ________some people in Asia may not think ________necessary.

A．that；it B．when；that

答案　C

解析　先行词为case，point，situation等表抽象地点的名词时，定语从句要用where来引导。第二个空考查it作形式宾语，necessary后面省略了真正的宾语to use "please" and "thank you"。

10．The flight delayed taking off ________ the storm.

A．due to B．because

答案　A

解析　due to意为"因为"，是介词短语；because和as后都需接从句；as a result因此，为副词短语。题中空格后为名词，且由句意"因为暴风雨，飞机推迟了起飞"可知A项正确。

Ⅱ.完形填空

The 1990s saw great changes in the way people communicate.People could send mails without going to the __1__，and go shopping without leaving home.__2__ like email and download became part of people's vocabulary.The cause of this great change was the __3__.