A:promise
B:heart
C:habit
D:rule
—How nice your schoolbag is!
—— .
510÷60的商是____位数, 510÷40的商是____位数,
630÷80的商是____位数, 630÷50的商是____位数,
— At least you have given me some advice.
人生就像穿衣服,扣扣子,如果第一粒扣子扣错了,剩余的扣子都会错。这启示我们( )