In revising and editing your papers, but then make the revisions and corrections yourself. If your teacher discovers that you didn't do the work you submitted, the teacher may take punitive action against you. See the BSU Student Handbook, 1993-1994, pp. Also, teachers hate going through the ugly procedures they have to start when they discover plagiarism, so if it doesn't happen, everybody is happier. Well, that's what EN 121, EN 122, and EN 123 are about.
Good papers accomplish their purposes.
Think about your audience. Your teacher is almost always your audience, but sometimes the teacher designates other audiences for you to consider. In either case, remember that readers want to be interested and respected. Good papers get through to their intended readers. Use a moderate tone, unless you have strong reason otherwise.