Mike: I'm going ( ⓐ ) a diet these days.
Mi-na: Are you pleased with your diet?
Mike: No. I haven't lost any weight ( ⓑ ) last month.
Mi-na: ⓒThat's unbelievable. You haven't had meat at all since you started diet.
Mike: No, I haven't.
Mi-na: Then, why don't you try to work out?
Mike: That's a good idea. Thanks.