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。

I’m not________up so early yet but I have to________myself to it.— Yeah. Just as the saying goes, “An early bird catches the worm”. [ ]

The weather here in summer is so changeable.Please take an umbrella when you go out. —________.

His school is 15 kilometers ______ the museum,

The writer had trouble complete sentences