Unexpected things? Xia Ziwei's composition

The class began and the students quieted down. The teacher went to the podium, took the starting list, and held a pen in his right hand. Then, she put the pen cap behind the pen. The pen escaped from the teacher like a naughty doll and fell to the ground. The teacher opened his mouth wide and reached for it, but it was too late. The pen fell to the ground. The teacher quickly picked it up and read it again and again. When he saw that there was no problem, he put the roll call in his hand. Roll call is like a little doll lying in the teacher's hand. She picked up a pen and called the roll. She found that the pen was out of water. The teacher looked at the nib and said gloomily, "I dropped my nib."

The teacher found some boys to help the teacher find a pen. Xiaohong touched it on the ground, and Kong Ao carefully stretched out his index finger, gently pressed it on the small black spot and stared. Li Minghui shouted: "I found it!" The teacher smiled at us. She put the pen ball on the tip of the pen and drew several circles on the paper, just like dancing. Suddenly, the pen became thicker and the teacher dropped it again. It seems that this pen is really broken.