Many teachers believe that the responsibilities for learning lie with the students.【B1】a l

The【B3】student is considered to be【B4】who is motivated(激发) to learn for the sake of【B5】, not the one interested only in getting high grades. Sometimes homework is returned【B6】brief written comments but without a grade. Even if a grade is not given, the students is【B7】for learning the material assigned. When research is【B8】, the professor expects the student to take it actively and to complete it with【B9】guidance. It is the【B10】responsibility to find Books, magazines, and articles in the library. Professors do not have the time to explain【B11】a university library works; they expect students,【B12】graduate students, to be able to exhaust the reference【B13】in the library. Professors will help students who need it, but【B14】that their students should not be【B15】dependent on them. In the United States professors have many other duties【B16】teaching, such as administrative or research work.【B17】, the time that a professor can spend with a students outside of class is【B18】. If a student has problems with classroom work, the student should either【B19】a professor during office hours【B20】make an appointment.

【B1】

A．If

B．Although

C．Because

D．Since