二、听句子，选择最佳答语。
6. A. When I was four. B. After four years. C. In five years.
7. A. Yes, it is. B. Yes, it was. C. Yes, it did.
8. A. Twice a week. B. Two miles. C. For three hours.
9. A. From the countryside. B. Under the bed. C. To the park.
10. A. Old coins. B. Playing tennis. C. A writer.
