There was a ring at the bell Today's first class is math. Teacher Duck is explaining the addition operation. At this moment, Teacher Duck found Xiaohua Mall dozing off. She asked Xiaohua Mall, "2+2=?" When Xiaohua Mall found himself asleep in class, he was awakened and blushed.

After class, Xiaohua Mall knew he was wrong and apologized to Miss Duck. It turns out that Xiaohua Mall went to catch mice in the middle of the night last night.