联系上下文填空完成对话。
Fang Fang: Mum, may I _____________ to Shanghai?
Mum: To Shanghai? I don't know.
Fang Fang: Shanghai is very beautiful.
Mum: But we live _____________ Changchun. Shanghai is _____________ _____________ here.
Fang Fang: You can come, _____________.
Mum: OK! You may go. But I _____________ go there.
Fang Fang: Why?
Mum: Because I have to work.
Fang Fang: Oh! I'm sorry to hear that.
