There is nothing to do but ______ the experiment.

A．It is cheaper to travel by train than by plane.
B．The railway station is usually at the center of a city.
C．When you get off the plane you will find yourself right in the city center.
D．No motorcar or plane can carry as many goods as a train does.

A．The railways are dead now.
B．Motorcars and planes have made the railways unnecessary.
C．We’ve entered the age of super-fast trains.
D．The advantages of the railways enable them to be alive even nowadays.