According to the writer, more dust
bins
should be placed
in every ten meters.
Discussion:
Anyway I notice that most of the students in our school have responsibilities for their school environment. They put their litters on the proper places. But some are not diligent enough to find the dust bins. The numbers of dust bins in our schools. are not enough. More dust bins should be put beside each of steps, outside of the classrooms, and some
more along the conridors. Probably one dust bin should be in every ten meters. So when students want to throwaway their litters, they can find the dust bins easily.