Tom is seven. He goes to school on Monday to Thursday. The school is next to 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.
It’s good to answer the teacher’s question, what’s the question?
The question is: who puts ink (墨水) on my chair?