Complete thepassage using the correct form of the words and phrase below. alternative sharpen identify regardless of aware excavation assume ample primitive due Davidson Blackwas a Canadian doctor who organized the __________ that led to the discovery ofthe bones in the Zhoukoudian caves near Beijing. He was a specialist in thestudy of bones and it was his ambition to find and _______ bones of earlyhumans. His university was _____ of the significance of his work. At first theygave him _______ time to do this research, but later they realized he wasprepared to pursue it ___________ his students’ needs and his teaching career,so they forbade him to travel there any more. It was his assistant, PeiWenzhong, who made the discovery of these _________ bones and ___________ stonetools. Somehow hecycled thirty miles to Dr Black because there was no __________ means oftransport. Dr Black ________ this discovery would change the way academicsthought about early people in China. He knew that his success was almostentirely ____ to his assistant’s systematic hard work.