In Class 3 (1), he came last. Students often make fun of him and say it's useless. Every day after school, the student on duty does some cleaning work, and he will take the initiative to stay and help take out the garbage. What's more, in class during the day, every two classes, he will reflexively take the trash can to the washing table and scrub it carefully in the dirtiest corner, because Agua's responsibility has become the most eye-catching pure land in the classroom.