A．The man’s major is genetics.
B．The man and woman are studying together.
C．The man sometimes works on more than one project at a time.
D．The man has completed one project and started another.

A．The man and woman are talking about different concerts.
B．The man and woman have heard different things about the same concert.
C．The man and woman are going to a concert together.
D．The woman has heard that tonight’s concert will be interesting.