50.A: Kathy, what do you do to stay in shape?
B: I exercise a lot. Instead of getting around by bus or MRT, I walk to get around.
A: ________________ If I do this, I can not only exercise but also save some money.
(A)I think you’re crazy. (B)But it may take a lot of time.
(C)That sounds like a good idea. (D)Staying in shape is impossible.