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.When he was in the train, the conductor(列车员)asked him for his  ticket.Mark Twain looked for the ticket here and there, but he couldn't find it.The conductor knew Mark Twain.She said,'Show me your ticket on your way back.And if you can't find it,it doesn't matter.' 'Oh,but it does,' said Mark Twain.'I must find the ticket.if I can't find it,how can I know where I'm going?' 1.One day Mark Twain went to ________ by train. A.see a film B.see one of his friends C.see the writers 2.Mark Twain usually forgot something because ________. A.he was usually ill B.he couldn't remember anything C.he was very busy 3.The conductor ________ Mark Twain. A.knew B.didn't know C.wanted to know 4.When he was in the train,the conductor wanted to ________. A.talk with him B.know his name C.see his ticket 5.If Mark Twain couldn't find his ticket,________. A.he had to buy another one B.he had to get off the train C.he couldn't know where he was going