I want to be a model student. What shall I do?

　　I should be polite. I should study hard. I should capful and helpful. I should walk in the corridors. I should throw rubbish in the bin. I should be quiet in the library. I shouldnt walk and run on the grass. I shouldnt throw rubbish on the floor. I shouldnt run in the corridors. I shouldnt fight. I shouldnt be noisy in the library.