根据短文内容和所给中文提示，在空白处写出单词的正确形式。每空限填一词。
Do you feel tired of the same old daily life? “Survival Holiday” is for children to go into the lonely place for exciting activities. We will take children into the great outdoors ____ (没有) their parents this summer.
Why do more and more people ____ (支持) “Survival Holiday”? Because they think being close to ____ (大自然) is good for children. Many children in big cities spend all time watching TV and ____ (冲浪) the Internet. And parents ____ (关心) too much about them. “Survival Holiday” can bring them an important change.
The survival activities will improve the children in many ways. Even years later, they will still ____ (清晰地) remember what they have learned. Some have learned how to work in a team and to be more ____(有创造力的). Some have learned to keep calm in difficult times.____ (其他) have learned how to keep safe. All these ____ (技能)will help them a lot in their lives.
Come and join us in the “Survival Holiday”! It will be a ____ (明智的) choice and you will achieve a lot.
表示的平面区域是一个三角形，则s的范围是 （ ）
