why just stand there with your mouth closed You are expected to air your opinion—________You have another supporter in me

Why do you look so sad?— With so many problems________,I’m in a difficult situation. [ ]

If you sleep less than 7 hours a day, you are moreto catch a cold.

May I ask a question after class, Sir—______, but not during my lunch break.

在下面一段话空缺处依次填入词语，最恰当的一组是刘勰的《文心雕龙》论述了文学的形式与内容、继承与革新等关系，构建了宏大而 的文论体系，初步 了我国文学史观，成为我国古代文学批评中前所未有的系统的文学理论专著，也是我们现在进行文学创作、文艺批评研究的 的理论依据。