affirmative (true) and negative (XBy the age of 30, Captain James Cook had visitedmany exotic places, but he (be) to Australia. XBy the age of 30, Captain James Cook had visitedmany exotic places, but he hadn't been to Australia.1 The Portuguese explorer Vasco da Gama(see) penguins before he travelled to SouthAfrica in 1497. X2 After he (make) a pilgrimage to the cityof Mecca in 1325, Ibn Battuta decided tobecome an explorer.3 Many explorers (try) to climb Mount Everestbefore Tenzing Norgay and Edmund Hillaryreached the peak in 1953. /4 People in Europe (not eat) potatoes untilChristopher Columbus brought some fromAmerica. X5 More than 400 years after Magellan (sail)around the world, the US submarine Tritonmade a similar journey underwater.​