Many teachers believe that the responsibilities for learning lie with the student.【21】____

Many teachers believe that the responsibilities for learning lie with the student. 【21】______ a long reading assignment is given, instructors expect students to be familiar with the 【22】______ in the reading even if they do not discuss it in class or take an examination. The 【23】______ student is considered to be 【24】______ who is motivated to learn for the sake of 【25】______ , not the one interested only in getting high grades. Sometimes homework is returned 【26】______ brief written comments but without a grade. Even if a grade is not given, the student is 【27】______ for learning the material assigned. When research is 【28】______ , the professor expects the student to take it actively and to complete it with 【29】______ guidance. It is the 【30】______ responsibility to find books, magazines, and articles in the library. Professors do not have the time to explain 【31】______ a university library works; they expect students, 【32】______ graduate students, to be able to exhaust the reference 【33】______ in the library. Professors will help students who need it, but 【34】______ that their students not be 【35】______ dependent on them. In the Unit ed States, professors have many other duties 【36】______ teaching, such as administrative or research work. 【37】______ the time that a professor can spend with a student outside class is 【38】______ . If a student has problems with classroom work, the student should either 【39】______ a professor during office hours 【40】______ make an appointment.

【21】

A．If

B．Although

C．Because

D．As