Select the most appropriate option to fill in the blanks.

James Cook was one of the famous explorers ______ all times. As a young boy in England, Cook fell in love with the sea. ______ his childhood, his ambition was to be a sailor. Cook worked hard and became a superb seaman. As a sailor, he was not satisfied with sailing only to familiar cities. ______ he really wanted to do was to ______ strange unknown lands.