口语应用：在下列横线上填入适当的话语，使对话完整、正确。

A: May I come in?

B: Come in, please. I'm in the study.

A: Hi, Susan.

B: Hi, James.

A: 1._____________________?

B: I'm looking at the photos!

A: Yes? Can you show them to me?

B: 2. _____________________. Here you are.

A: Oh, what photos! Where did you take them?

B: Don't you see the Palace Museum?

A: Oh, you've been to China! 3.________________?

B: During our summer holiday

A: Whose camera did you take them with?

B: Mine. I had a digital one before I left.

A: 4.____________________?

B: It cost me 300 dollars.

A: Well, that's great.