12-year-old Tony is a lovely but naughty(淘气的) boy.He is so playful that he often forgets things.Jimmy is one of Tony's good friends.They live close to each other,so they often play together.On the weekend,they like playing in the city park across from Tony's house.Last Sunday afternoon, when they were playing table tennis in the park,Jimmy was surprised to see a metal ring on Tony's finger(手指).Jimmy never saw Tony wear a ring before,so he asked,"Tony,why are you wearing the ring?"Tony answered,"My mother asked me not to forget to post her letter!"Jimmy then asked,"But where is the letter? You have nothing in your hand and you are not carrying any bag! "Tony laughed and said,"Well,I guess my mother forgot to give me the letter."Both of them found it funny and they couldn't help laughing."I think your mother should also wear a metal ring,"said Jimmy.