If あなた have it, あなた want to share it. If あなた share it, あなた don't have it. What is it?
A secret.

The もっと見る あなた have of it, the less あなた see. What is it?
Darkness

What book was once owned によって only the wealthy, but now everyone can have it?
You can't buy it in a bookstore または take it from a library.
A telephone book.

What gets whiter the dirtier that it gets?
A chalkboard

What happened in the middle of the twentieth century that will not happen again for 4,000 years?
The 年 1961 can be read upside down and that won't happen again until 6009!

What has no beginning, end, または middle?
A doughnut.

What has to be...