请阅读下面短文，根据短文内容，从文后所给的选项中选出能填入空自处的最佳选项，使短文意思通顺。选项中有一项为多余项。
Recently, teenagers face many kinds of problems. Like many of them, I was once troubled with worries and dissatisfaction. Few people could understand my feelings.
"The problem with your generation is that you always expect to be happy," my mother once said. Shouldn't we try hard to achieve it?
But now I have noticed a change in my thinking. I gradually realize what my mother said was correct. Over these years, many studies have shown that we are crazy about happiness and high personal confidence. In fact, we may often be happier when we stop focusing on happiness.
We should also reset our expectations of the future. Don't expect miracles (奇迹), and accept that no matter how hard we try, feelings of failure and unhappiness will appear from time to time. When we feel sad, it's often because we have learned something painful but important. At the same time, we should learn how to deal with them better than trying to make them disappear.
As my mother tried to teach me all those years ago, "Prepare for the worst, hope for the best, and be unsurprised by everything in between."
A. Neither could my parents.
B. We should keep the stress off ourselves.
C. Surely happiness was the purpose of living.
D. That may make us less satisfied with our lives.
E. Happiness arrives when we are least expecting it.
F. So it's necessary for us to accept sad feelings as part of life.
@Dale Hello. 
@Dale, 
I believe you can do a good job.
@Amy@Joe Thanks a lot.
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