根据首字母提示完成短文所缺单词
One day,the American w＿ Mark TWin went to a city b＿ train.He wanted to see a friend of h＿.He was a very busy man and he often f＿ something.
When he was in the train,the conductor asked him f＿ his ticket.Mark Twin looked for it here and there,but he couldn't find it.The conductor k＿ him.She said,"S＿ me your ticket on your way b＿ home.And if you can't find it,it doesn't matter."
"Oh,but it does." said Mark Twin,"I must find it.If I can't find it,how can I know where I'm going."