The following text refers to question.
The ongoing mystery of hiccups
Humans ________ long tried to cure hiccups by ________ water or ________ scared. Here’s what scientists ________ about how this reflex ________ – and how to stop it. Sierra Pisenti knows hiccups. She really, really wishes she didn’t. Hers are loud and painful, can last for hours, and have shown up more than a dozen times a month since she was a tiny baby. A bad bout feels like being punched in the chest. “It’s a nightmare,” says Pisenti, a stay-at-home mom from California. Your hiccups probably aren’t as bad as Pisenti’s, but you likely recognize the dreaded sensation: a tightening in your chest, the characteristic “hic” – and the desperation to make them end. And you probably have the same question as her: “How is it possible that there isn't a solution?” Hiccups have roots deep in our evolutionary history. ________ after millions of years, tens of thousands of years of human problemsolving, and decades of modern medicine, their origin and purpose is still largely opaque. “Things like this, that are considered obvious or very simple, are often overlooked by many doctors,” says Mark Fox, a gastroenterologist at University Hospital in Zurich, Switzerland. “Swallowing, eating, drinking, what happens in normal life – none of this stuff will kill you if it doesn’t work well. But it will ruin your life!”
Available in: https://www.nationalgeographic.com/science/article/
Mark the alternative that fills in the gaps of the first two sentences of the excerpt.
