A：　Linda, would you care for some candies or cookies?
    B：　No, don't try to tempt me. I'm becoming chubby, and I have to slender down.
    A：　You are not really chubby. You are actually thin enough.
    B：　I don't think so. I know I've put on weight this winter.
    A：　So you are watching your weight, aren't you?
    B：　Yes, to tell you the truth. I am on the diet.