单词拼写。

1. We always travel by public t____.

2. He gave the taxi f____ to the driver before he got off.

3. When you go on a journey, you'd better keep a travel j____.

4. Father is thankful to me for p____ him to give up smoking.

5. We are flying at an a____ of 20,000 feet.

6. Some people have a wrong a____ towards the disabled.

7. Does environment d____ one's character?

8. Let's remember the b____ actions of the heroes.

9. He is so s____ that no one can persuade him to do anything.

10. Where does the Mekong River have its s____?

该企业的网络采用核心层、接入层的两层架构方式。根据层次化网络设计的原则，MAC层过滤和IP地址绑定等功能主要应在由 (6) (请罗列出图9-7中相关交换机的名称)组成的 (7) 层完成。
针对图9-7中的网络拓扑结构，各台交换机需要运行 (8) 协议，以建立一个无环路的树状结构网络。当图9-7中交换机1～交换机3之间的某条链路有故障(或失效)时，为了使阻塞端口直接进入转发状态，从而切换到备份链路上，则需要在图9-7中交换机1～交换机3、交换机5～交换机8上使用 (9) 功能。