根据句意及首字母提示填写单词。

1. Now some students begin to think of how to spend the coming winter v______.

2. Don't t________ the paper everywhere on the street.

3. Tom was so pleased that I a___________ his birthday present.

4. I'm not kidding. It's s_______.

5. I can't come in because I can't find my k________ to the door.

（12分）世界上50多亿人口的100多亿只手掌各不相同，且手掌上的每个手指的指纹都不相同。为此，华夏银行将储户的指纹输入计算机内，作为身份证明，长期以来推行“一指妥”业务。

从哲学意义上讲，“每个手指的指纹都不相同”的原因是什么？