1 . 人类的行为导致了我们的环境污染的这个事实我们都知道。（同位语从句）
___________________________________________________

2 . 事实上，他认为一个人有了太多钱，他的麻烦事只会更多，而不是更少。

3 . He always gets___________(情绪紧张) before an exam. （根据中文提示完成句子）

4 . Many parents frankly admit that they have trouble_______(bring) up their children. （所给单词适当形式填空）

5 . In less than 18 months, there were over 200,000 people reading my________________ (博客)! (根据汉语提示填空)

6 . Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.

A．when

B．before

C．while

D．since

7 . Mr. Smith was thinking about how to explain to the manager why he was late for work, when a good idea ______ to him.

A．happened

B．brought

C．occurred

D．struck