选择句子，补全对话，将序号填在相应的横线上。

A. How old are you, Lucy?  B. Mum, this is my friend, Tom. C. Thank you.    D. Nice to meet you, too. E. How many candles?

Tom: Happy birthday. Lucy.

Lucy: Come in(请进), Tom. Tom, this is my mum.

Mum: Nice to meet you.

Tom: Wow, the cake is big!

Lucy: I'm 10 years old.

Tom:

Lucy: Let's count.

Tom&Lucy: One, two, three. . .

Tom: Ten candles!

Lucy: Let's eat the birthday cake.

Tom: Great!