阅读理解。

　　He was well-known for his works and humour．Everybody knows Mark Twain was a famous American writer．But before he was famous, even his neighbours didn’t know him well．

　　One day Mark Twain went to borrow a certain book from a neighbour in Tarry town．

　　“May I borrow a book from you?” he asked politely．“Yes, ” the neighbour told him, “but I must ask you to read it here．You know I never let anybody take my book out of my study．”

　　Some days later the neighbour wished to borrow Mark Twain’s machine for cutting grass in the garden．

　　“May I borrow your machine to cut the grass in my garden?” the neighbour asked with a smile on his face．“Certainly．” Mark Twain told him, “but I must ask you to use it here．You know that I never let anybody take my machine out of my garden．”

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