Many ..... have sailed around the world throughout history. Our lives would be very different if these people hadn't risked their lives traveling to unknown seas and continents.

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Many ..... have sailed around the world throughout history. Our lives would be very different if these people hadn't risked their lives traveling to unknown seas and continents. (*) precursors (*) promoters (*) explorers (*) exploiters

This is a companion discussion topic for the original entry at https://english.best/questions/19676,many-___-have-sailed-around-the-world-throughout-history-our-lives-would-be-very-different-if-these-people-hadnt-risked-their-lives-traveling-to-unknown-seas-and-continents/