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.