18.Bill has a volleyball and some ping-pong balls.
"Let me play with your volleyball, Bill." Tony says.
"No. You can make it dirty (脏的)."
"Let me play with your ping-pong balls, Bill." Frank says.
"No, you can lose them."
Now no one plays with Bill. He plays with his balls
alone. It's boring.
After school, Bill sees Frank and Tony playing soccer. "Come and play with us, Bill," Frank says to Bill.
"Thanks, but I can't play soccer. It's difficult." Bill says.
"We can help you. Come on!" So Bill plays with his classmates. He finds it's fun to play together (一起).