i found a lot of paper scraps and dust in the corridor. i put down my schoolbag. i quickly picked up the broom and a dustpan and walked to the top floor. i bent down and carefully cleaned every corner. unconsciously，放下書包，我彎下腰，不知不覺掃到了6樓，看到一排排干干凈凈的樓梯，我放學回家