tom is 7 years old . his school is near his home , so he goes there on foot and always comes home on time .

but one day , he was late coming home .

his mother asked him : why were you late today ?

i was in the headmaster‘s office , tom answered .

why were you in the headmaster ‘ s office ? his mother asked .

because my teacher asked us a question in the class . nobody could answer it except for me . tom answered .

that doesn ‘ t sound too bad ,his mother said .

but the question was ‘ who put ink on my chair ‘?