听一段对话,回答第11、12小题。
(
A
)11. What does the boy's mum advise him to do with the old things?
A. Sell them online.
B. Throw them away.
C. Give them to friends.
(
C
)12. Why does the boy want to keep the toy cars?
A. They are very expensive.
B. They are still new and useful.
C. They help him remember the old time.