补全对话。每空一词。
Dave: Hi, Mona! I am going to have a birthday ____. I want to have it on Saturday evening. Can you come?
Mona: Oh, I am going to ____ my grandfather on Saturday evening.
Dave: What about Sunday?
Mona: I have to take the piano lessons.
Dave: Oh! When are you ____ then?
Mona: Well, Friday is fine.
Dave: Friday? That’s tomorrow! OK. We can have it then. Can you ask Ali to ____ us?
Mona: Sure. When and where shall we meet?
Dave: Near our school gate at half ____ four.
Mona: Great! See you then!
Dave: Bye!
