A．He is suffering from the difference of time zones.
B．He has been studying hard at night.
C．He finds biology difficult to learn.
D．He has not adjusted to a new culture.

A．She will make another plan to help the man.
B．She will think of the doctor’s advice again.
C．She will find out why the marl started smoking.
D．She will consider if she is going to marry the man.