The problem of the university is an environment are dirty. It have very junk and bad smell. Moreover, the classrooms are dirty sometime to look it isn’t to study . It make the student not very pay attention to the study. This cause from the student not to help each other defend clean and to abandon the junk not order in addition, they are not pay attention to clean , not to make clean the classrooms.
That line the correct errors in printing is each the student to help each other defend to clean. The student discard the junk that right then, it can recover recycle and it can pick up the junk recover to make extra cash for everyday life.