Spring cleaning is upon us. It's time to clean up the school and welcome the new year. The students are eager to do so. They're worried that if they don't do it, they'll get spanked the next year. One of the students says that spring cleaning is so amazing that it'll make Mr. Yang "never wake up" in the future. The other students agree, and they're all eager to get started. First, they need to clear out the trash from the desks and drawers. Then, the students need to put all the trash by the door and have their two classmates pick it up. Everyone is clear on what to do, so they can go home. Those who haven't cleaned up well enough can stay with the students. The student who hasn't done well enough is allowed to go home first, and those who have cleaned well enough are allowed to stay with them. He says that he's in charge of the cleaning of the walls, and he'll use a special rag to clean the walls. He'll also use this rag to scrape the stains off the