Ответ:

1 - b: Heyerdahl received a number of awards during his lifetime.

2 - a: Heyerdahl went to the Galapagos Islands before leading an expedition to Easter Island.

3 - c: Heyerdahl became curious about how the islands were inhabited while he was staying in Polynesia.

4 - d: He set out to prove his theories after giving up his study of Geography.