Galileo a)instead b)also c)therefore made some important discoveries in mechanics

too that the earth was not the fixed centre of a)an b)a c)the universe as Ptolemy had said.

and made other people a)to see b)see c)seeing 

He saw a)by b)from c)with his own eyes

His a)observing b)observations  c)observed and calculations confirmed that Copernicus and Kepler were right.

and four of a)the b)their c)its moons,the phases of Venus and spots on the sun