Doctor：You look terrible. ?
Bill：I've got a pain in my back.
Doctor： ?
Bill：For about two weeks.
Doctor：Let me have a look. Where do you work?
Bill：I work in an office.
Doctor：Do you play computer games?
Bill： . I usually play computer games late at night.
Doctor：That's it. You spend too much time in front of the computer.
Bill： ?
Doctor：You should stand up and do some exercise at times. Don't play computer games too much.
Bill：Thanks a lot，I will take your advice.
Doctor：You're welcome. .
