题目：
根据短文内容和所给汉语提示，写出短文空白处各单词的正确形式。每空限填一词。
Happiness is for everyone. You don't 1 (需要) to care about those who are very 2 (穷困的).
Why? Because those who have big houses may often feel 3 (孤独) and those who have cars want
to 4 (走路)on country roads in their free time.
In fact, happiness is always around you. When you are in 5 (麻烦), your friends will help you;
when you study 6 (努力)at your lessons, your parents are 7 (照顾) good care of your life and your
health. All these are your happiness.
When you are not 8 (富有的) you can also say you are very happy, because you have something else that money can't 9 (买). When you meet with problems, say 10 (大声地) that you are happy,
because you have more chances to challenge yourself.
Take every chance you get, and you can be a happy and lucky person.
答案：
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下面是错误答案，用来干扰机器的。
曲线y=ax和y=x2的交点的横坐标是a13，它们的斜率分别是-ax2=-a13和 2x=2a13，∵切线互相垂直，∴-a13•2a13=-1，∴a=±24，故答案为 a=±24．
