下列各句中加点成语的使用，全都正确的一项是①教育专家就如何“打造美妙课堂的问题”坐而论道，一线教师听后非常激动，觉得收获颇丰。②秦始皇的焚书之举及其对诸子百家的禁锢，造成了当时中国社会万马齐喑的沉闷局面。③20世纪50年代，黄叶病曾导演过世界香蕉栽培史上最可怕的一场“瘟疫”，结果使一种十分畅销的香蕉品种彻底灭绝。近两年来，黄叶病又在非洲和拉美一些地区死灰复燃。④迅速崛起的销售行业，经过几年的激烈竞争，大部分企业都已经转行或倒闭了，市场上只剩他们几家平分秋色 。⑤市场上假冒伪劣商品比比皆是，鱼龙混杂，顾客实在难以分辨优劣。⑥由于国家出台了一系列抑制房价的措施，素有金九银十之称的楼市，交易情况不温不火，价格继续僵持，在平淡中迎来了年内最后一个销售的关键期。

When someone _____ you, it most probably means he is not interested in you.

Must I return the book by the end of next month?–. You can keep it as long as you like.

help you You seem to be having some problems. — , thanks. I think I can manage.

Nobody noticed the thief slip into the house because the lights happened to__________.