Many teachersbelieve that the responsibilities for learning lie with thestudent._________(51) a long reading assignment is given,instructors expectstudents to be familiar

withthe_________(52) in the reading even if they do not discuss it in class or takean examination.The__________(53) student is considered to be one who ismotivated（激

励）to learn forthe sake of_________(54),not the one interested only in getting highgrades.Sometimes homework is returned________(55)brief written comments but

without a grade.Evenif a grade is not given,the student is_________(56) for learning the materialassigned.When research is________(57),the professor expects the student

to take it activelyand to complete it with minimum guidance.It is the_________(58)responsibilityto find books, magazines,and articles in the library.Professors do not have

the time to explain_________(59)a university library works;they expect students,______(60)graduatestudents,to be able to exhaust the reference sources in the

library.Professorswill help students who need it,but_________(61)that their students should notbe too dependent on them. In the United States professors have manyother

duties________(62)teaching,suchas administrative or research work.________(63),the time that a professor canspend with student outside of class is_________(64).If a

student has problemswith classroom work,the student should either approach a professor duringoffice hour_________(65)make an appointment._________(57)

A.collected

B.distributed

C.assigned

D.finished