......... geometry, which has served as the foundation for all learning since the time of the Greek civilization.

.................... (the type of geometry you studied in high school), was so popular and dominant that no one, for over two millennia, doubted its truthfulness, questioned its authority, or thought of coming up with an alternative. 

Another amazing accomplishment of Euclid was that he proved tons of propositions—........ to be exact—based on a very small number of assumptions.

A line can be drawn through any three points

A line can be extended indefinitely in both directions

A circle can be drawn with any center point and any radius.

over in Russia (yes, in a totally different country), there was another person who was independently working on the same idea, coming up with pretty much the same results. His name is .........

was the lesson good?