A．Because most of us have to do our jobs.
B．Because most of us have chosen the wrong jobs.
C．Because most of us have to earn living from our jobs.
D．Because most of us spend a great part of our lives doing our jobs.

A．Get the university’s approval in advance.
B．Follow Susan’s advice about traveling abroad.
C．Take more French courses to improve his skills.
D．Make inquiries about the requirements for teaching chemistry.