There was a school with students who really love to eat "ice cream". One day, the cafeteria brought two boxes of ice cream that have only once a year, and put a sign about it at the "hallway". When one class of students saw it, they wait for the time that they can eat the ice cream on lunch. But then, in their next subject, their teacher says that they have to learn how to use "tape recorder" by themselves in lunch and homeroom time. So, they can't go to the cafeteria and eat the ice cream and wait for it until next
