　　Everyone has trouble, and you should learn how to deal with it. For example, you and another student are busy with the performance on Christmas party. You've really made efforts on it, but your teacher chooses another student to perform but not you. You feel disappointed, of course. At that time, speak to yourself like this, “I give this opportunity to others, how great I am! I can have a happy night all the same although I can't perform.” And then, just enjoy yourself at the party. So, the key is, switch. Besides, never trouble trouble until trouble troubles you.

　　Just like a song puts:“Happiness is such an easy thing, don't worry, be happy!”