Zhang: Where are you going to do on Christmas?
Wu: I’m going to the gallery with my friends.
Zhang: What do you want to do there?  
Wu: I want to see an art show. The theme(主题) is about nature.
Zhang: Sounds great, how I wish I can also go there.
Wu: Why not join us?
Zhang: I’m going to the department store with my father.
Wu: What do you want to do there?
Zhang: I’m going to buy a present for my mother.