M: We are almost at the end of our tour now. And I hope you've enjoyed it. ,F: I certainly have. It's being a most interesting day.
(A) M: I’m sorry, I don’t understand. Could you say it again? (B) M: I am very happy that you all enjoy this tour very much. (C) M: I'm happy you enjoy the meal. (D) M: Dear daughter. How about flying to US to spend our summer holiday?
B