阅读下面的对话，然后判断正误。

Mike and John: Happy birthday to you, Sarah!

Sarah: Thank you.

Mike: How old are you?

Sarah: I'm nine.

Mike and John: Here you are, two bags and some dolls(玩具娃娃)．

Sarah: Thank you. How many dolls?

John: Four dolls.

Sarah: Let's eat the cake.

Mike and John: Great!