#1

1* It is a history book because the boy tells his own history.

2* The black dog wants the captain`s box and kill the captain, but he did`t find the box and runs away the inn. The sailors were out the inn and kill the black dog.  When the boy and his family get to the inn the captain  was dead, but the boy found the box and inside was a great treasure. And the family lived happily forever.

3* Yes, two

4*  Ship- Boat :  The ship has been traveling around the world for a long time.

      Sailor- Mariner: Is the job where the person has to travel around de world