Last Saturday Grandpa took Charlie to the park with his new bike．The weather was fine and they were surprised (惊讶的)that no children were riding bikes．Charlie rode his bike happily and Grandpa read his newspaper under a big tree．Then a man in uniform(制服)came up to Charlie．"Can't you see the sign?"he asked．"You shouldn't ride your bike here．"
Grandpa and Charlie looked at the sign．It said "No bicycles"．They didn't see the sign because there was a coat over it．A man left his coat there．But then he took it away and left the sign clear．"We are really sorry," said Grandpa and Charlie．"Huh， "said the park keeper．"You should learn to read．"
