1．We must follow the principle(原则)that education should be fair to everyone.
2．It does serious harm to children's character that too much violence(暴力)is shown on television.
3．The product is of very good quality(质量)，so it sells well.
4．In my opinion，it is a mean(卑鄙的)thing to do.
5．Our family vote(投票表决)to turn to the lawyer for help.
