假定你是李华，准备参加学校举办的主题为"健康成长"的英语作文比赛。请按要求写一篇短文，主要内容包括：

　　 1. 乐观的人生态度；

　　 2. 努力学习；

　　 3. 参加体育锻炼。

　　生词：态度attitude

　　注意：1.词数100左右；2.可以适当增加细节，以使行文连贯；3.开头已为你写好。

　　One possible version

　　 We all want to grow up happily and healthily, and for this goal we must do several things.

　　 Firstly, we should develop a good attitude to life. Life consists of not only sunshine but also hard times. We should be brave in front of difficulties. Secondly, we must study hard because knowledge is power. If we have the power. We can help to build our country and enjoy life better. In order to study well, we need to do sports so that we can keep fit. We can go running, play ball games or simply take a walk after a day's study. If we do those things well, we will be able to grow up happily and healthily.