A. To make sure that blind people have the same rights as everyone else.
B. To provide the blind with a white lane for crossing a street.
C. To encourage people to volunteer to help the blind.
D. To draw attention to the blind with a cane or a dog in crossing the street.

A. He used to live in the country.
B. He used to work in the city.
C. He works in the city.
D. He lives in the country.