Questions 19 to 22 are based on the conversation you have just heard.

A．A company with dangerous working conditions is likely to be punished.
B．There are altogether three departments which protect customers and workers.
C．Stores dealing in foods and drugs are controlled by the local government.
D．The protection of workers’ health and safety is still not well ensured.

A．To tell him they are busy.
B．To cancel an appointment.
C．To send him a busy signal.
D．To invite him to go to a film.