A．He wanted to follow the tradition of his country.
B．He believed that it symbolized an everlasting marriage.
C．It was thought that a blood vessel in that finger led directly to the heart.
D．It was supposed that the diamond on that finger would bring good luck.

A．They set their own exams.
B．They select their own students.
C．They award their own degrees.
D．They organize their own laboratory work.