—I want to be a. I want to write books.
—She's a . She cleans the street.
—Yes, he is. He uses a digital camera to take photos.
—OK.
A. Two years ago, Mr Hong went to work by car. Now he goes to work by bike. It's good for his health and the environment.
B. In the past, people washed clothes by hand. Now they use washing machines.
C. In the past, children played hide-and-seek in the fields. Now they play computer games at home.D. In the past, people got water from a well. Now they get water from the tap.
