Directions: People in modern society live under a lot of pressure, from education, career, or family. So it is important for them to keep a good mood under whatever circumstances. Write a composition of about 200 words on the following topic: The Importance of Keeping a Good Mood. You are given the following outlines in Chinese and are required to write no less than 150 words. Remember to write clearly.

1. 现代社会压力增大，保持好心情很重要；

2. 为什么要保持好的心情；

3. 保持好的心情也是成功的保证。