Questions 11 to 18 are based on the conversation you have just heard.

A．Walking doesn’t stretch muscles too much.
B．Walking is the best way to keep fit.
C．Walking doesn’t put high pressure on bones and joints.
D．Walking makes muscles and joints tense with gentle stretch.

A．Because he had run out of gas.
B．Because his tires were stabbed.
C．Because he bad heard a noise.
D．Because he was attracted by Mrs. f Jones.