One day after school the teacher said to his students，“Tomorrow morning，if any one of you can answer my first question.I'll permit him or her to go home earlier.” 
一天，放学以后，老师对他的学生们说：“明天上午，如果你们当中的任何一个同学能回答我的第一个问题，我就准许他或她最先回家。”

The next day，when the teacher came into the classroom，he found the blackboard daubed.
第二天，老师走进教室时发现黑板已被乱涂

He was very angry and asked，“Who did it?Please stand up! ”
他非常生气地问：“谁涂的? 请站起来。”

“It' s me，”said Bob，
鲍勃说：“先生，是我”

“Now，I can go home，Good-bye，Sir! ”
“现在我可以回家了，再见。”