A: Morning!  1_
B: We'd like to make a trip for 2010 EXPO in Shanghai.
A: We have many different kinds of visiting groups.  2  
B: I'm not sure what kinds of groups you can have.
A: We have family groups, old people groups, student groups. The family groups and the old people
groups can start at any week. The student groups will only start during their summer holiday.
B: We'd like to choose a family group.
A: It's really worth visiting. Which hotel do you want to live in?
B:   3  Which hotel do you think is comfortable?
A: The Holiday Hotel is very good. What's more important, there are different kinds of houses for you to
choose.
B: We don't want to live in an expensive hotel. That's what we'll do.
A:   4_
B: OK.  I'll ask my wife to fill in the form.  By the way, is it all right if we pay by credit card?
A: Yes, it's quite all right.   5_
B: Thank you.

A. we
B. us
C. our
D. ours