填入下面横线处与上下文衔接最恰当的一句是（ ）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”，慢慢地我们吃辣椒就上瘾了。

Start out right away, ______________ you’ll miss the last train.—Don’t worry, but have you seen my ticket?

I’m sorry I’m late but I had a ____ tyre. — Never mind. Just go to your seat. [ ]

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Mr Green drove slowly on the way home until he reached the highway, ____ the speed limit was 60 miles per hour [ ]