阅读下面短文，从短文后各题所给的四个选项（A、B、C、D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

    An American teacher walked up and down in a classroom while she was teaching stress management to her students. As she 1 a glass of water, everyone 2 they would be asked the “half empty or half-full” question.

    3, with a smile on her face, she asked, “how 4 is this glass of water?”

    Answers called out 5 from eight to twenty ounces(盎司).

    She quieted the students down and then replied, “The absolute weight doesn't 6. It all depends on how long I hold it. If I hold it for a minute, it's not a 7. If I hold it for an hour, I'll have an ache in  my 8. If I hold it for a day, my arm will feel 9 and paralyzed. In each case, the 10 of the glass of water doesn't change, but the longer I hold it, the heavier it becomes. Do you know why? ”

    All the students kept silent and listened carefully, lost in thought. She continued, “Our 11 and worries in life are like that glass of water. Think about them for a while and 12 happens. Think about them a bit longer and they begin to 13. And if you think about them all day long, you will feel paralyzed -- 14 to do anything.”

    It's important to remember to 15 your stresses. As early in the evening as possible, put all your 16 down. Don't carry them through the evening and into the night. Remember to put the glass down!

    More often than not life gets terrible 17 we think too much. And the moment you remove your burden, you'll find yourself feeling so much more 18.

    So rather than moping around (闲逛) and feeling sorry for yourself, 19 doing something about it. After all, life is too short to 20 yourself to anything that's not making you happy.