Humor--- an important role in life
One possible version:
Humor, as we know, is of great importance in our life. A sense of humor can help you win a lot of friends. If you are humorous you will always attract a lot of people around you. A sense of humor can also help to ease the tension between people. When people are about to quarrel, a humorous remark leading to laughter can help settle the problem.
There are many ways to learn how to be humorous. Being together with someone who is humorous is one way. Reading some books which contain humor or humorous stories is another. But the most important way is that we should try to be optimistic about our life at present and, moreover, our life in the future. (112 words)