情景选择。根据对话情景，从每题所给的三个选项（A、B和C）中，选出最佳选项。
— I am sorry I lost your pen.
— _______
A. It doesn’t matter, I have another one.  
B. You should buy me a new one.
C. Be more careful next time.
— Would you like to go for a picnic with us this weekend?
— _______
A. I don’t like it. B. Yes, I’d love to.   C. I don’t want to go.
— We are going on a visit to the Great Wall.
— _______
A. Have a good time.    B. Don’t waste time.   C. I am so sorry to hear that.
— Would you mind not opening the window?
— _______
A. Yes, please. B. I’m sorry about that.   C. No, I don’t.
— I’m worried about the coming exam.
— _______
A. That’s too bad.  B. What a shame.   C. Don’t be nervous.