听下面一段对话，回答16，17两个小题

　　16. Whose on the left?

　　A. the boy’s mother B. the boy’s brother. C. the boy’s sister

　　17. Where is the boy’s mother?

　　A. on the left of her sister.

　　B. Between his brothers.

　　C. Behind his brothers.

　　听下面一段对话，回答18至20三个小题

　　18. How many stops does the woman walk to catch the bus?

　　A. One B. Two C. Three

　　19. How does the man go to school on Saturday?

　　A. By bus B. By bike C. On foot

　　20. What sports foes the woman do?

　　A. She play tennis B. She walks to school C. She swims