I went hiking to a mountain with my friend last summer. It was a good trip in the beginning and something unexpected happened halfway. One of my friends suddenly felt a terrible pain in his stomach and he couldn’t move any far. Nobody knew how to deal it. One girl tried to call her mum over her mobile phone, but there is no signal in the mountain area. Lucky we had brought a tent with us. We put it up and let him to rest in it. After taken some pills, he drank some water and ate some food. After a while, I felt much better and we walked on. We all enjoyed us on the top of the mountain.第一句：friend改成friends;
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(答案→)第一句：friend改成friends;
解析：
【小题1】从后文可以看出不止一个朋友，所以friend用复数friends。
【小题2】前后表转折关系，用but。
【小题3】any修饰比较级所以far改成farther。
【小题4】短语deal with“处理；解决”。
【小题5】整篇文章用过去时态，所以用there was。
【小题6】句首用副词，所以把lucky改成luckily。
【小题7】let sb do sth “让某人干某事”，所以把to去掉。
【小题8】after是介词，后面接doing，所以把taken改成taking。
【小题9】句意：过了一会，他感觉好多了，我们继续往前走。人称是he而不是I。
【小题10】短语：enjoy oneself“玩得开心”，所以把us改成ourselves。