Mark Twain was a great American writer .One day he went to a cityMark Twain was an American writer.One day he went to a city by train.He wanted to see one of his friends there.He was a very busy man.He usually forgot something.When he was in the train,the conductor asked him for his ticket.Mark Twain looked for his ticket here and there,but he couldn’t find it.The conductor knew Mark Twain was a famous writer.She said,“Show me your ticket on your way

“哦,但它确实有效,”马克·吐温说。“我必须找到机票,如果我找不到它,我怎么能知道我要去哪儿。”
find

翻译：
马克·吐温是位美国著名作家。一天他想坐火车去某城市看望他的一位朋友。他是个大忙人，经常忘记一些东西。
当他坐上火车后，检票员向他检查火车票。马克·吐温到处寻找却没有找到。检票员知道他是位名作家，就说：“在你回来的路上再给我看票吧。如果你真找不到也没事。”
“啊，不，这关系重大。”马克·吐温说，“我必须找到车票，如果找不到，我怎么知道我要去哪呢？”
（略有改动）
答案：
find

马克吐温是美国著名作家.一天他坐火车想去城市看望他的一位朋友.他是个大忙人,经常忘记一些东西.当他坐上火车后,检票员向他检查火车票.马克吐温到处寻找却没有找到.检票员知道他是有名作家,就说：“在你回来的路上再...

Mark Twain was an American writer. One day he went to a city by train. He wanted to see one of his friends there. He was a very busy man. He usually forgot something. 改成 one day he went to a city by train to his friends. He was a very busy man and always forgot something.
When he was in the train, the conductor asked him for his ticket. Mark Twain looked for his ticket here and there, but he couldn’t find it. 改成Mark Twain looked everywhere for the ticket but couldn’t find it. （又快又易懂）The conductor knew Mark Twain was a famous writer. She said, “Show me your ticket on your way back. And if you can’t find it, it doesn’t matter.” (问一下哦，既然查票人早就知道他是一位有名的作家，为什么还要向他要票呢，既然这样后面为什么还说找不到的话就算了呢，那为什么之前要多此一举呢？这不是病句嘛！）
“Oh, but it does,” said Mark Twain. “I must find the ticket, if I can’t find it, how can I know where I am going.”的中文翻译且回答一个问题：Mark Twain didn't show his ticket because he couldn't(find)it （供选择的答案有：buy \bring\find\know)
“Oh, but it does,” said Mark Twain. “I must find the ticket, if I can’t find it, how can I know where I am going.”(这里又为什么说如果找不到票的话我就不知道我要去哪里了？）
建议你一下，有的句子可以把它写成一段就写，不要把它分成太多句子