A、To pay the man back some money. B、To learn some exercise knowledge. C、To keep in good shape. D、To choose an expert she believe

M: Good afternoon, Madam. How can I help you?
W: Well, (19)I am a bit out of shape. I’m thinking about exercising to keep fit. I have heard so much about exercise these days yet even the experts can’t agree on which exercises are best. So what do you provide?
M: First of all, we’ll design a custom-made work-out plan according to your habits. We can use the scientific methods to make your plan. You can use a heart rate monitor to know your heart rate or something like this.
W: How can I get that done? I just do the plan by myself day by day?
M: Well, (20)you have a qualified personal trainer assigned to you. He will give you a fitness assessment and then come up with the work-out plan for your needs. Since everyone is different, your personal trainer will find you suitable exercise equipment and teach you all the techniques to help you achieve your fitness level and goals.
W: Sounds pretty good. How much does it cost?
M: That depends. We offer memberships for one month, half a year and one year. (21)But you will get a great deal this week for our Anniversary Sale.
W: Really? Maybe I’ll do one month. Just have a try first—not too tough at the beginning. What are your business hours?
M: Wise decision. You’ll find it’s totally worth it. We are open from six a. m. to midnight. You are welcome anytime.
W: OK, from six to midnight? I’d better arrange my schedule in advance.
19. Why did the woman come to the man?
20. Which of the following is the personal trainer’s responsibility?
21. Why will the woman receive special discount this week?