根据对话内容，从所给的七个选项中选出可以填入空白处的最佳选项，使对话内容完整。有两项为多余选项。

A: Hello. This is Mr King speaking.  

B: Hi, Dad. This is Betty.

A: Hi, Betty.  

B: I'm in the Palace Museum with my friends.

A: Really? I hear it is an ancient palace. 

B: It's over six hundred years old.

A: Wow! That's amazing.

B: Well, you don't have to come to Beijing. You can visit it online.

A:  I will visit the museum website right now!

B: Have a good trip, Dad! Ha ha ...

A. Good idea.

B. How old is it?

C. Where are you now?

D. Who's calling, please?

E. I am afraid I don't like it.

F. What's the weather like today?

G. I really want to visit it one day.