阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
On the west bank of the Mississippi, there is an unusual house with a white fence, preserved (保存) 1 a museum in memory of its former owner — Mark Twain. It is said that many of the 2 (character) and stories from his novels 3 (base) on real-life experiences that he had there as a boy. Mark Twain’s family moved to this house in Hannibal, Missouri when he was 8 years old. However, the family was so poor that they had to move out of the house for a while, 4 (live) above a local drug-store in exchange for his mother’s 5 (serve) as a cook. They managed 6 (move) back long after his father’s death, in 1847. Ten years 7 (late) at the age of 22, Mark Twain started to work as a journalist on a riverboat, 8 he wrote many famous books. These books include The Adventures of Huckleberry Finn, 9 anti-racist story that wins its readers’ heart but is 10 (fierce) criticized for using racial terms.