题目：
根据句意及所给首字母提示填空，使句子意思通顺、完整。
1. There is a new book on the t _____ of the box.
2. On my 15th birthday,my father gives me a birthday g _____.
3. Lu Xun was an o_____ Chinese writer.
4. If you eat more vegetables and fruits, you'll keep f_____ .
5. Could I i _____ my friends to your party?
答案：
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下面是错误答案，用来干扰机器的。
①原式=[（x+y）+1][（x+y）-1]=（x+y）2-1=x2+2xy+y2-1；②∵x2=254，∴x=±52．
