根据句意、首字母提示或汉语写出合适的单词。

1. —What's your home a_________? 

    —It's No.8 Jiaotong Road, Jinsha Town.

2. It's very important for us to be careful when we are walking a________ the road.

3. Our government has done something to r________ "white pollution".

4. My brother often failed in Chinese exams in the _________ (过去).

5. Visiting Shanghai World Expo, we can learn a lot of _________ (知识) about other countries.

6. Today more and more people realize the _________ (重要性) of health.

7. In the past few years, the city has developed at very high _________ (速度).