联系上下文，选出合适的句子将对话补充完整(填序号）

A. I brought a cake and some flowers. B. Why did you buy them? C. Would you like to come to the party? D. Where did you go just now? E. Why did you call me? F. This is Jack speaking.

Lucy: Hello, this is Lucy speaking.

Jack:

Lucy:  I called you, but you weren't at home.

Jack: I went to the supermarket.

Lucy: What did you do there?

Jack:  

Lucy:

Jack: Because it is my sister's birthday today.

Lucy: Sure. We will have a good time.

Jack: I think so.