题目内容：

Considered an all-around inventor and often mentioned in the same sentence1.Thomas Edison,Eli Whitney is best known2.the invention of the cotton gin（轧棉机）in 1793 or 1794.Simply put,a cotton gin is a machine that 3.(use) to pull cotton fibers from the cotton seed（种子）.The cotton gin4.(be) a pioneering invention early in the southern United States,and it had5.great positive effect on the economies of the southern states in the US.The cotton gin also had an6.(equal) important effect on slavery in this country.Before Whitney's cotton gin,7.(raise) cotton required much labor and only a few8.(field) could favourably raise cotton.The cotton gin changed cotton into a widespread,money making and less labor-intensive（劳动密集型的）crop,leading to the rise of cotton9. (produce) in the Deep South.It is different to draw a conclusion with absolute certainty that the cotton gin directly 10.(lead) to an increase in slavery,but the cotton gin clearly was a major factor contributing to slavery issues in the South.