bad habit

Ko ko like to misplace his things wherever he goes.....After doing his homework, he can left his books on the table....eraser on the floor....ruler on the sofa...colour pencils in the other room and etc ....I really headache keep reminding him to keep his things properly. One day, after school he told me that teacher has keep his colour pencils because he didn't keep properly so I asked him to say sorry to teacher and get it back. Next day, I asked him whether teacher has returned the colour pencils to him and he said yes then I asked whether he has said thank you to teacher ? he asked 'why lei ? that colour pencils is mine not teacher mah......' *****rolled eyes******