How to write the writing purpose of the composition "drawing lots"

Today, the school gave out coupons for the exhibition of paleontology evolution and dinosaurs. Because there are many people in our class and there are not enough tickets, Teacher Pan decided to draw lots.

Class cadres take action at once. I took out some draft paper from the cupboard, and everyone tore it into small pieces of paper, 58 pieces each. Teacher Pan wrote the numbers on 38 small pieces of paper, the others were empty, and then folded all the pieces of paper and put them together.

Our rule is this: every student has the opportunity to choose one from a pile of pieces of paper. If there are numbers on the selected pieces of paper, there will be coupons; if there are no numbers, there will be no coupons.

Everyone thought it was fair, so they all agreed.

The first person to draw lots is Hu Sheng. He looked at so many pieces of paper, hesitated, carefully took out one from it, and then slowly opened it. He looked at it and his expression was ugly. I don't think so! Then, the students draw them one by one. Some students smiled happily, and some students regretted it: "If only I had taken that one!" " "Some students jumped around excitedly.

It's my turn I'm a little nervous. Look at this, and then look at that. I don't know which to choose. Whatever, just pick one. So I closed my eyes and drew a picture. I opened it carefully. An "8" jumped into my eyes and I jumped with excitement.

This incident made me understand that fairness and justice are very important.