阅读下面短文,根据短文内容选择正确答案。
Think of life as a game in which you are playing with five balls in the air. You name them work, family, health, friends and spirit and you keep all of them in the air. You will soon understand that work is a rubber (橡胶) ball. If you drop it, it will bounce(弹跳) back.
But the other four balls, family, health, friends and spirit, are made of glass. If you drop one of these, they will be broken. It will never be the same. You must understand that and try to have balance in your life. How?
Don't look down on yourself by comparing with others. It is because we are different and each of us is special.
Don't let other people set goals for you. Only you know what is best for yourself.
Don't give up when you still have something to give. Nothing is really over until the moment you stop trying. Don't be afraid of difficulties. Be brave!
Don't run through life so fast, or you will forget not only where you've been, but also where you are going.
Don't be afraid to learn. Knowledge is a treasure you can always carry easily.
Don't use time or words carelessly. You can't get them back. Yesterday is history, tomorrow is a mystery, and today is a gift; that's why we call it "the present". Life is not a competition but a trip, step by step.