【选择填空】将下列选项填入对话中。 stop, mention, get off, fare, problem P: Excuse me. Does this bus go to St. Paul's Cathedral? D: Yes, sir. It does. P: Thank you. How much is the _____? D: Drop fifty cents in the box, please. P: OK Could you please let me know when I should _____? D: No _____. It’s sixth _____. But I will also let you know. P: Thanks so much. D: Don't _____ it.