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.