根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。
Be pleased to do anything even though it is very tiny. In fact, there's no single thing that is not worth doing or you are not able to do. So living a happy life with a light heart is the most important. A good mood decides your quality of life. Then 1 can you live a happy life?
Make each day meaningful(有意义的)by helping someone or just making someone smile. The feeling which makes you want to help others 2 at the bottom of your heart. Happiness depends on your feelings in your heart. Helping others is helping yourself. By helping others, you 3 more. Seeing their satisfied smile will make you feel 4 of what you have done.
Face difficulties bravely in your life. 5 may meet with difficulties. No one can avoid them. The difficulties can teach you a lot. They are your treasure. They will help you to be closer to 6 Focus on the good experiences you 7 in the past few years. Be grateful to life. Don't think too much about the negative things. They 8 bad weather. Bad weather will pass sooner or later, and so will the negative things. You may find many dead ends in your life, but you will 9 find your way out of them. Everything will get better at last.
Never worry about the things you can't change. Worrying isn't useful. Worrying can 10 change the situation 11 solve any problem. Perhaps, not every dream will be realized; not every effort(努力 ) will be completed. Never mind, and take it easy.
Come on, everybody! Let's live a happy life with a light heart and enjoy the beautiful sunshine every day.