The text is about the discovery of the new continent austral

The text is about the discovery of the(用a 不用定冠词） new continent australia by james cook,（加上in which变成定语从句）he describes(用gave a description of更好） the life of the aborigines（直接为the aborigines'life好些） on the new land.
改正后：The text is about the discovery of a new continent australia by james cook,in which gave a description of the aborigines'life on the new land.
In 1770,after Cooks(加上's) first launch,he was resent to Australia on behalf of the British King in order to(用so as to通顺些) take possession of(用take over,take possession of意为占领某种财富) the eastern coast in Australia.
改正后：In 1770,after his first launch,Cooks was resent to Australia on behalf of the British King ,so as to take over the eastern coast in Australia.
During his mission,Cook met some aborigines with whom he couldn't communicate at all.Thus He was forced to go back and stay on his boat to keep observing(observe是及物,应在后面加上the island).
Although the tribe didnt seem to be as cultivated as they were,Cook was fascinated about(用by) their weapons and （加上their)way to live(改为of living)