A．They should focus more on the sight rather than buying gifts．
B．They have just passed a tourists' service center.
C．There might be a post office at the tourists' service center.
D．The tourists' service center will have some good souvenirs.

A．The woman can't find her purse．
B．The man is in need of some tissue．
C．The woman's friend stole her purse.
D．The woman is careless and forgetful.

A．They can have a talk before the plane's departure.
B．His arrival time won't be suitable for the meeting．
C．He will deal with the emergency during his trip.
D．His flight has been delayed to almost midnight.