Dialogue Three Clerk: ___1___ Lady: I'm sorry, but this is the first time I've ever come here, so I don't really know my way around your store. Clerk: What are you looking for? Maybe I can point you in the right direction. Lady: I'd like to buy some ladies' wear. Clerk: That would be on the second floor. Lady: Oh, thank you. By the way, do you have after-sales service here? Clerk: Of course, if you find there is something wrong with your purchase, just bring it back within 30 days for an exchange or a full refund. ___2___ Lady: No, thank you. ___3___ Clerk: I hope you enjoy yourself. A. Is there anything else I can help you with? B. You've already been most helpful. C. Can you give me the invoice(发票)? D. What can I do for you?