请通读下面对话，根据对话内容，从下面的选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。

Dad: What are you doing on the computer, Ann?

Ann: （1）

Dad: Do you know them well?

Ann: （2） They are my friends in real life.

Dad: Good. You know, it can be dangerous to make friends online.

Ann: Sure, Dad. （3）

Dad: That’s right. And you may advise your friends to be careful, too.

Ann: I will tell them later. In fact, I’ll meet them this afternoon.

Dad: （4）

Ann: To the city library. We’ll work as volunteers there for the Internet Safety Day.

Dad: I’m so proud of you. （5）

A. Have fun there! B. It’s my pleasure. C. Don’t worry, Dad. D. Where are you going? E. I know I need to protect myself. F. I’m chatting with my friends online.