A. It allows them to meet students from other universities.
B. It promotes the concept of self-learning.
C. It allows more flexibility in students’ schedule.
D. It doesn’t require any examinations.

A. Because many young people have moved into comfortable apartments.
B. Because many old houses in the bad part of the town are not inhabited.
C. Because many older people sell their houses after their children leave.
D. Because many people have quitted their old houses to build new ones.