根据听到的句子，选择适当的应答句。 (     )1. A. It's great pity. (     )2. A. Once a week. (     )3. A. Sorry to hear that. (     )4. A. Never mind. (     )5. A. Thanks. (     )6. A. Sorry, I can't. (     )7. A. I'm afraid you can't. B. Don't be afraid. B. In 2008. B. You should be careful. B. Certainly. B. Good luck . B. I agree with you. B. Yes, there are. C. Have fun! C. For about three weeks. C. What's up? C. The same to you. C. Enjoy  yourself! C. Take it easy. C. Cross the first turning and turn right.