Who Puts Ink on My Chair

Who Puts Ink on My Chair

Tom is seven. He goes to school every day. 

The school is near his home. So he goes there on foot and comes back home on time. 

But today he is late. His mother asks him, “ Why are you late today?” 

“ I am in the headmaster's office. ” “ Why do you go to the headmaster's office?” 

“ Because my teacher asks us a question in class, and nobody can answer it, but I can. "