Sentence 1: Mark had always loved fast cars. 
 Sentence 3: Throughout his teen years he spent most of his time in mechanics class 
 Sentence 4:  In his adulthood he was able to work in a pit crew 
 Sentence 5:  After years of hard work he debuted as a drag racer 
 Option 1: When he was a boy he always said he wanted to sell cars. 
 Option 2: When he was a boy he always said he would be a racecar driver.