__2__ the train, Mike put his head out of the window every minute. His father said,“Mike, be __3__ ! Don't put your head out of the window!”But Mike didn't __4__ his father and went on putting his head out of the window. His father could do __5__ .

　　Then Mike's father wanted to __6__ a joke on his son. He took Mike's cap quietly, hid it __7__ his back and said,“You see, your cap has__8__away.”Mike touched his head and it was really gone. The boy looked __9__ and then he began to cry. He wanted to get his cap back.

　　“Don't worry, son.”said his father,“I have a strange __10__ to get your cap back.”

　　“__11__ can you get it back?”asked Mike in surprise.

　　His father said,“Close your eyes and whistle（吹口哨）once, and maybe your cap will come back.”Mike came __12__ to the window, closed his eyes and whistled. Just at that __13__ , his father quickly put the cap on the son's head.

　　“Oh! It was __14__ !”Mike laughed. He was pleased, then he quickly took his father's cap and __15__ it out of the window.” Now it is your turn to whistle, Dad!”he said happily.