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。
写作：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 time.
