13. A. To clean up their school.   B. To clean up some public places.      C. Both A and B.

12. A. Because they want to ask their teachers for help.

   B. Because they want to ask some students for help.

   C. Because they want to ask foreign volunteers for help.

11. A. Clean-up Day.          B. Tree-planting Day.                 C. Mother's Day.

10. A. Very good.                   B. Quite interesting.                 C. Very difficult.

(三)录音中有一组对话和五个问题，听对话和问题两遍后，从每小题A、B、C三个选项中，选出能回答每个问题的最佳答案。

9. A. At 6:35.                 B. At 5:55.                   C. At 5:45.

8. A. Oliver.             B. Tom.                     C. Mary.

7. A. Yes, I can.           B. No, I can't.                C. Yes, I do.

6. A. She has gone to her hometown.       B. She is returning from her hometown.

C. She is leaving for her hometown.

5. A. Yes, I think it helps.         B. I like listening.             C. No, I haven't.

(二)录音中有五组对话和五个问题，听对话和问题两遍后，从每小题A、B、C三个选项中选出能回答每个问题的正确答案。

4. A. I often read in the morning. B. No. I haven't.                C. By working with a group.