依次填入下列各句横线处的成语，最恰当的一组是（ ）① ，重视纪律，是警察最重要的界线。但若打破警界线，勇探与悍匪合作，侦缉与破案能力可能变成无限大。②在我们社会主义社会里，是非、善恶、美丑的界限应 ，坚持什么、反对什么，倡导什么、抵制什么，必须旗帜鲜明。③ 的美国联邦众议院通过应急预算法案，让政府在新年度得以维持运作，但此法案也斩断了总统奥巴马医改法案财源。

You’re sure to make rapid progress if yourplan for study ________ ahead of time.

Part of the reason Charles Dickens loved his own novel, David Copperfield, was ______ it was rather closely modeled on his own life.

You leave your kid alone at home. It’s very dangerous.

1——Why is the classroom sodirty——Sorry, Sir. It_____ yesterday. We forgot to do it.