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.
