Normally a student would at least attend ______ classes each week.

A．they hate the constant pressure and strain of their study
B．they will then be able to stay longer in the university
C．such positions help them get better jobs
D．such positions are usually well paid

A．dealing with the academic affairs of the university
B．ensuring that the students observe university regulations
C．evaluating students' performance by bringing them before a court
D．keeping up the students' enthusiasm for social activities