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10. They know that English is an international language
It is
English..
11. People think that Jack London's life and writing represent the American love of adventure
Jack..
It....
12. They say that Jonh is the brightest student in class
It is
John...
13. They reported that the President have suffered a hear a heart attack
It is
The President....
14. They think that he has died a natural death
....