A．if customer complaints go unnoticed by the management
B．unless foreign companies are introduced in greater numbers
C．if there’s no competition among companies
D．without strict routine training of employees

A．they can have it fixed in no time
B．it’s no longer necessary to make an appointment
C．the appointment takes only half a day to make
D．they only have to wait half an hour at most

A．revengeful customers are a threat to the monopoly of enterprises
B．an ad campaign is a way out for enterprises in financial difficulty
C．a good slogan has great potential for improving service
D．staff retraining is essential for better service