5.Jane was asked a lot of questions，but she didn't answer　　of them.

解析：句意：Jane被问了许多问题，但她一个也没有回答。not any表示完全否定，也可以说：Jane was asked a lot of questions，but she answered none of them。

答案：any

4.Over the past 20 years，the Internet has helped change our world in　　way or another for the better.

解析：考查固定短语。in one way or another意思是“以某种方式”，相当于by some means。

答案：one

3.Being a parent is not always easy，and being the parent of a child with special needs often carries with　　extra stress.

解析：句意：当一名父亲或母亲并不总是容易的，当一名有特殊需要的孩子的父亲或母亲经常还要承受额外的压力。此处的it指代的是前面提到的“being a parent is not always easy”这种情况。

答案：it

2.The CDs are on sale！Buy one and you get　　completely free.

解析：语意为：光盘特价了！买一送一！空白处填one，指代one CD。

答案：one

1.One of the most important questions they had to consider was　　of public health.

解析：句意：他们必须考虑的最重要的问题之一就是公众的健康问题。句中that特指前面的question。

答案：that

10.解析：由than可知前面的形容词要用比较级；因expensive是多音节形容词，故填more。

答案：more

9.解析：在名词trip前作定语，要用形容词；由长时间躺在箱子里可知，旅途是“不舒适的”，故填uncomfortable。

答案：uncomfortable

8.解析：因admit后要求用doing作宾语。

答案：hiding

7.解析：修饰形容词要用副词，由后文的that可知，填so，构成so...that...句型。

答案：so

6.解析：作定语用形容词形式，woolen表示“羊毛制的”。

答案：woolen