1) Before Captain Cook went to his last expedition to Hawaii, ...
b)...he had been to Australia, the Antarctic and the Arctic.
2) Captain Cook had been to Australia before ...
a)...he visited the Antarctic.
3) Before Captain Cook went to the Arctic in 1776, ...
e)...he had been to Australia and the Antarctic.
4) Before Captain Cook explored Hawaii, ...
c)...he had visited the Arctic.
5) Captain Cook had joined the Navy before ...
d)...he went to Australia.
6) Before Captian Cook went to the Antarctic ...
f)...he had been to Australia.