根据对话内容，从下面方框中选出恰当的句子补全对话。

A. Can I try a piece now? B. Would you like some? C. Here you are. D. When will Rita come back from work? E. What's that on the top?

A: Hey, Mum! The cake looks nice.

B: Thank you.

A:

B: That's cheese.

A: Mm, the cake must be delicious.

B: Sorry. It's for your sister Rita's birthday.

You have to wait for her and then we eat it together.

A:

B: In an hour.

A: I see. But now I am really hungry.

B: Here are some chicken hamburgers.

A: Yes, please. Get one for me.

B: