Many teachers believe that the responsibilities for learning lie with the student. (1)____

Many teachers believe that the responsibilities for learning lie with the student. (1)_____ a long reading assignment is given, instructors expect students to be familiar with the (2)_____ in the reading even if they do not discuss it in class or take an examination. The (3)_____ student is considered to be (4)_____ who is motivated to learn for the sake of (5)_____, not the one interested only in getting high grades. Sometimes homework is returned (6)_____ brief written comments but without a grade. Even if a grade is not given, the student is (7)_____ for learning the material assigned.

When research is (8)_____,the professor expects the student to take it actively and to complete it with (9)_____ guidance. It is the (10)_____ responsibility to find books, magazines, and articles in the library. Professors do not have the time to explain (11)_____ a university library works; they expect students, (12)_____ graduate students, to be able to exhaust the reference (13)_____ in the library. Professor will help students who need it, but (14)_____ that their students should not be (15)_____,dependent on them. In the United States professors have many other duties (16)_____ teaching, such as administrative or research work. (17)_____, the time that a professor can spend with a student outside of class is (18)_____.If a student has problems with classroom work, the student should either, (19)_____ a professor during office hours (20)_____ make an appointment.

A．If

B．Although

C．Because

D．Since