Quiz

     There was a man who liked caves. One day, he knew a mysterious cave. He wanted to go to the cave. He took a vacation and went there. He looked forward to entering there. However, he stopped entering the cave as soon as he saw something. What did he see?

Quiz

     Mr. Sawada wanted a pen, so he went to a stationary store to buy the pen.
The stationary store had two kinds of pens. One is 100 yen, and the other is 80 yen.
He wanted 100 yen's one. He gave the shopkeeper 100 yen. Then the shopkeeper gave Mr. Sawada 100 yen's pen with a silent. Mr. Sawada  went back home with a joy. However, why the shopkeeper gave Mr. Sawada 100 yen's pen? Perhaps Mr. Sawada might want 80 yen's pen and change, 20 yen.