阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
O.Henry was a pen name     1    (use) by an American writer of short stories. His real name was William Sydney Porter. He was born in North Carolina in 1862. As a young boy he lived an exciting life. He did not go to school for very long, but he managed to teach     2    everything he needed to know. When he was about 20 years old, O.Henry went to Texas,     3    he tried different jobs. He first worked on a newspaper, and then had a job in a bank. When some money went     4    (miss) from the bank, O.Henry was believed     5    (steal) it. Because of that, he     6    (send) to prison. During     7    three years in prison, he learned to write short stories. After he got out of prison, he went to New York and continued writing. He wrote     8    (most) about New York and the life of the poor there. People liked his stories, because simple     9    the tales were, they would finish     10    a sudden change at the end, to the readers’ surprise.