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答案及解析:
1. 去掉first前面的the
2. end—ended
ended与began一同做谓语
3. 去掉named后面的after
4. reality—existence
此处表示“现存的”
5. is—was
6. containing—contains
7. ususl—unusual
8. included—including
9. people—peoples
表示“民族”
10. its之后加own
强调该百科全书属于the world book company特有
n. 说明，须知，指令，教学
