根据短文内容回答问题。(Answer the questions according to the passage．)

　　Samuel Clemens was born in 1835, in the state of Missouri．When he was four, his family moved to the town of Hannibal, Missouri．Hannibal was a port on the Mississippi River, and Clemens loved to watch the big steamboats going up and down the river．He said that all the boys in his school had one ambition in life：to work on a steamboat!

　　His father died when he was just 12 years old, and Clemens then went to work for a printer to help support his family．He travel around, and worked in many different cities．But when he was 22, he achieved his ambition when he got a job working on a steamboat．He sailed up and down the wide Mississippi River until the American Civil War began．

　　He then moved around America, tried several jobs．He was a soldier, and a silver miner．He started working as a writer on a newspaper．It was at this time that he decided to use a pen name for his stories, and he chose the name‘Mark Twain’．

　　The name is interesting．It comes from his days on the steamboats．One man used to throw a piece of rope into the water．There was a heavy weight on the end of the rope, and the rope had some marks on it．The man used the rope to find out how deep the river was．Then he shouted out,‘Mark One’or‘Mark Twain’, meaning‘Mark Two’．Each mark was about two metres, so when he shouted‘Mark Twain’, it means that the river was deep enough for the big boat．

　　In 1865 Clemens wrote a story about a jumping frog．The story and the writer became famous．In 1867 he toured Europe．He married when he returned, and lived for most of the rest of his life in Harfort, Connecticut．He wrote many books, including The Adventures of Tom Sawyer, which he wrote in 1876．He also gave many lectures, and became a very famous and popular man．

　　Once two of his friends decided to write to him, but they had lost address．So on the envelope they just write‘Mark Twain, God knows Where’．Several weeks later, they received a reply from the writer．It just said，‘He did’!

　　Samuel Clemens died in 1910．He is considered to be one of America's most important writers．

1．What jobs did Mark Twain try after the American Civil War began?

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2．When did Samuel Clemens begin to use his pen-name‘Mark Twain’?

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3．What did‘Mark Twain’mean?

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4．What was his earliest famous story?

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5．How old was Mark Twain when he died?

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