在横线上填上适当的单词,使对话完整。
A: are these, Jim?
B: Hello, Tom. They are nice photos. Yesterday I took some.
A: did you go?
B: I went to the Great Wall. Look at this photo, this is the Great Wall.
A: How nice it is!
B: is it?
A: It is more than twenty thousand kilometres long.
B: it in Beijing?
A: Yes, it is.
B: is it?
A: It's about ten thousand years old.
B: Next week I will go there for my weekend.
