11. One afternoon, Charlie and his friends went to skate. When they (1) the skate park, they were very excited.
"Come on. Let's not waste (2) said Charlie. "Put on your helmets and knee pads (护膝), and let's begin!"
"I don't need to wear a helmet or knee pads, because I'm a (3) skater," said Tony.
"No, Tony. (4) experts need helmets and pads when they skate," replied Charlie.
"Thank you (5) your advice, but I won't wear them," said Tony.
Everyone tried their best to persuade (说服) Tony, (6) they all failed (失败).
At last, they gave up and (7) skating. Suddenly Tony fell over. Everyone ran to (8) quickly.
Tony got a big bump (肿块) on his head. Soon the bump grew bigger and redder. It made Tony scared and he began to cry. Charlie got some (9) for him.
Tony had to sit and watch the others have fun. He (10) that it's important to keep safe (安全的).