cung' kha' lau roi` toi khong len len day.khong biet' tinh` hinh` cac' ban dao nay` the' nao` roi`.Chuan' bi tthi roi` chuan' bi dc j` chua?toi hoc ma` chang' vao` dc the' mi' deu' chu'.Chac' la` phai' nho` vao` tai` lieu thoi.khong biet' co' ai lam` tai` lieu` chua nhi' ai ma` lam` thi` cho tui voi' nhe'.thoi tui ve` day chao` cac' ban nhe'