A．by keeping its original shape and color
B．in the life of cut flowers
C．to produce carbon dioxide
D．for as long as possible
E. by controlling temperature
F. to replace the water and solution every day Another important way to prolong the life of cut flowers is ______.

A．She does not attract young men.
B．She has undergone many changes over the years.
C．She is 11.5 inches tall.
D．She has managed to keep up with fashion.

A．Even dogs are interested in the computer.
B．E-mail has become very popular.
C．Dogs are liberated from their usual duties.
D．E-mail deprives dogs of their owner’s love.