一面墙的面积是20平方米，已经刷完了整面墙的 $\frac{2}{3}$ ，已经刷完的面积是____平方米。

“凑够一摄人就可以走了，和红绿灯无关”。一条“中国式过马路”的微博在全社会产生了强烈反响。

   据统计，2012年1至10月，我国平均每天2.6人死于闯红灯肇事，86人死于违反道路标志线肇事。2012年12月2日是首个“全国交通安全日”，中央文明办等部门围绕“遵守交通信号，安全文明出行”的主题，联合部署了相关活动。海拉尔区公安局开展了交通安全宣传教育活动，组织民警走上街头，走进学校和社区，以丰富多彩的形式，宣传普及道路交通安全法律法规，提高人们的交通安全意识。

据悉，你校学生会打算组织一批志愿者参与本次宣传教育活动，请你加入并完成如下任务：

动物的生活环境不同，其运动方式也不尽相同，鲸的运动方式是（  ）

                                                                              A Trip to the Forest
   One day Bob took two of his friends into the mountains. They put up their tents and then rode off to a forest to see how the trees were growing.
   In the afternoon when they were about ten kilometres from their camp（营地）, it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp?
   Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house? That would be a trip of thirty-five kilometres in such cold weather!
   It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them could tell. John looked around. What was that under the tree? It was one of their tents!