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）
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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. |
﹣﹣These days，teenagers often have to do what they____to．
﹣﹣It's not good for their independence．They need to think on their own．（ ）
A．tellB．are telling
C．are told
﹣﹣﹣It's the second time I came to Xiamen．It____a lot．
﹣﹣﹣Yes，it's more and more beautiful．（ ）
A．was changingB．has changed
C．will change
﹣﹣﹣Tom，let's hang out after school．
﹣﹣﹣Sorry．I have_____Frank to work on the biology report with him．（ ）
A．advisedB．expectedC．promised
﹣﹣﹣These shoes look cool．_____are they？
﹣﹣﹣They are on sale，only 69dollars．（ ）
A．How muchB．How longC．How many
﹣﹣﹣I think everyone should play a part in saving our environment．
﹣﹣﹣I agree．For example，there will be less air pollution_____we drive less．（ ）
A．ifB．soC．though