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Teaching and learning Many teachers believe that the responsibilities for learning lie with the student. If a long reading assignment is given, instructors expect students to be familiar with the information in the reading even if they do not discuss it in class or take an examination. The ideal student is considered to be one who is motivated to learn for the sake of learning, not the one interested only in getting high grades. Sometimes homework is returned with brief written comments but without a grade. Even if a grade is not given, the student is responsible for learning the material assigned. When research is assigned, the professor expects the student to take it actively and to complete it with minimum guidance. It is the students responsibility to find books, magazines, and articles in the library. Professors do not have the time to explain how a university library works; they expect students particularly graduate students to exhaust the reference sources in the library. Professors will help students who need it, but prefer that their students should not be too dependent on them. In the United Stats professors have many other duties besides teaching， such as administrative or research work. Therefore, the time that a professor can spend with a student outside of class is limited. If a student has problems with classroom work, the student should either approach a professor during office hours or make an appointment. | 
