Find a suitable word to complete the following passage. Mark Twain is a famous American writer. His real (1) ________ was Samuel Longhorn Clemens and “ Mark Twain” was (2)________ pen-name. Samuel Clemens was born in (3)________ small town on the Mississippi river in the USA. The boy had many friends at school and when he (4)________ a writer, he described them in his stories. (5)________ Samuel was twelve, his father died and the boy began to work and learned the profession of a printer. Samuel always (6)________ to be a sailor and when he was he was twenty he found work on a river boat. After some time he (7)________ the boat and went to live in California. Here he began to write short (8)________ under the name of Mark Twain. He sent (9)________ to newspaper. The (10)________ liked his stories very much. His best novel “The Adventure of Tom Sawyer” was published in 1876.