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　　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 shouldn’t walk and run on the grass. I shouldn’t throw rubbish on the floor. I shouldn’t run in the corridors. I shouldn’t fight. I shouldn’t be noisy in the library.