Questions 19 to 21 are based on the conversation you have just heard.

A．Bread, cheese, raw and cooked vegetables and beans.
B．Bread, butter, raw vegetables and beans.
C．Bread, cheese, beef and raw vegetables.
D．Bread, butter, raw and cooked vegetables and peas.

A．By getting in caught by a rainstorm.
B．By sleeping with the air-conditioning on.
C．By talking with the infected people.
D．By having a bad ventilation system.