看图完成对话，每空一词。

A: Hello.

B: Hi, Helen. is Nancy. a party in my house, would you like to come?

A: A party? That's great. Why?

B: It's my sister's birthday this Wednesday. She's going to be (九) years old.

A: Oh, sorry. I can't go on Wednesday.

B: I mean, her birthday is on Wednesday, but the party is on.

A: Oh, it's OK. What time will it start?

B: Atthirty p. m.

A: Oh, I see.