参考答案如下：
1. Yes, there is.
2. No, there isn't.
3. Yes, there are.
4. Yes, there is.
5. Yes, there are.
6. Yes, there are.
7. Yes, there are.
8. No, there isn't.
9. No, there aren't.
10. Yes, there is.
11. Yes, there is.
12. No, there isn't.
13. No, there aren't.
14. No, there isn't.
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