E-mail, as well as telephones, ______ an important part in our daily life. [ ]

填入下面一段文字横线处的语句，最恰当的一句是辣，我们都不陌生，很多人无辣不欢甚至吃辣上瘾，这是因为辣椒素等辣味物质刺激舌头、口腔的神经末梢时，会在大脑中形成类似灼烧的感觉，机体就反射性地出现心跳加速、唾液及汗液分泌增多等现象，___________，内啡肽又促进多巴胺的分泌，多巴胺能在短时间内令人高度兴奋，带来“辣椒素快感”，慢慢地我们吃辣就上瘾了。

Yesterday an old man’s house was ______ fire. The old man was hurt and now he is ______ hospital.

(2013·陕西，18)I have heard a lot of good things about you ________ I came back from abroad.

It was too noisy outside Not until ____at the top of my voice _____his head