To improve comfort and cleanliness at the school, there should be an increasing number of dust bins.
When we look at classroom, school corridors and schoolyard, there papers, mineral water cops, straws, and napkin everywhere. The condition of unseemliness really hinders learning and teaching environment. They can be filled out with water coming from the rain. This can be placed for mosquito to spread out.
Anyway I notice that most of the students have responsibilities for their school environment. They put their litter on the proper place but some of them are not diligent enough to find the dust bins. The numbers of the dust bins in the school are not enough. More dust bins should be put beside each step, outside of the classrooms and some along of the corridors. Probably one dust bin should be in every ten meters. So when students want to throw away their litters, they can find the dust bins easily.
When school is equipped with sufficient dust bins, students do not have problem of discomfort any more. So provide more dust bins and school will be very clean and become a very nice place to study.