—When can I come for the photos I need them this afternoon.
—They should be ready by 12 o'clock. You can ______ us, sir.

A．will soon become a problem for people living in central England
B．has now become a threat to the local residents
C．is quickly changing the map of England
D．can be stopped if proper measures are taken

A．be aware of the potential danger involved
B．guard against being cheated by the house agent
C．take the quality of the house into consideration
D．examine the house carefully before making a decision