补全对话，从方框中选择合适的句子补全对话。 A:  Mary, tomorrow is your Mum's 50 th birthday, do you know? B: Of course I do. 1 A: First of all (首先), a birthday present. 2 B: That's a good idea. It'll make her look young. And a big birthday cake, too, with 50 candles. A: 3 Will we have a special dinner? B: 4 A: Fine, where will we have it? B: Dad, we can have it at home and cook Chinese food for my mother. I'm sure Mum will like them. A: All right. Will you do some shopping too? B: 5 A: OK. A. What about buying a beautiful skirt? B. How about a Chinese dinner? C. That's right. D. Why don't we go together? E. How will we celebrate it? F. What's your present? What can I do for you?