A．Students attend it because it is required.
B．The student likes the course very much.
C．It is so popular that students line up to get registered.
D．The professor offers the course every term.

A．To find out ff the books she ordered are in.
B．To ask him to attend a Student Federation meeting.
C．To get his schedule of classes for next term.
D．To see if he has time to welcome the new students.