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19.NAME

Everybody knows that Christopher Columbus discovered America. However, America ______ after Amerigo Vespucci who explored the eastern coast of South America.

20.BE

Was he really the first to reach the continent? The great Norwegian explorer Thor Heyerdal believed that ancient people ______ able to build boats that could cross oceans.

21.LEAVE

To test his ideas, Heyerdal decided to build a copy of an ancient Egyptian boat. On May 25, 1969 the boat called Ra ______ a port in Morocco.

22.SEAMAN

On May 17, 1970 Ra with two ______ on board successfully crossed the Atlantic, proving that ancient civilizations had enough skill to reach America long before Columbus.