填入下面文段空白处的词语，最恰当的一项是（ ）高考作文要有读者意识。平时作文， ① 是写作者自赏， ② 是小范围好友传阅， ③ 是通过发表让公众了解，文章都是通过阅读获得生命力的， ④ 读者对于一篇文章来说很重要。考扬作文是一种在特定环境下的戴着镣铐的舞蹈，考生要有读者意识。考场作文的读者，就是那个未曾谋面的阅卷老师。其读者的特殊性 ⑤ 决定了写作的特殊性， ⑥ 决定了树立读者意识的必要性。 ①②③④⑤⑥

How did it________that the ancient building was burnt down in an hour?[ ]

He failed in the exam, ____ proves that he wasn’t working hard enough.

There is a widespread belief among the science world ____we keep on _____ the earth as we are doing today, the exist ence of us humans on this planet will be out of the question in some years yet to come.[ ]

Gary was behaving as if nothing _______.