听句子,选择最佳答语。 ( )1. A. It doesn't matter. ( )2. A. It's a good idea. ( )3. A. Don't worry. Nothing serious. ( )4. A. Yes, I am. ( )5. A. Yes, it was great, wasn't it? B. Forget it. B. What a pity! B. I'd like to buy a pen. B. Yes, please. B. Let's go to another match tomorrow. C. My pleasure. C. Remember to lock it. C. There is nothing wrong with me. C. OK. No problem. C. I'm sorry to hear that.