it ＿to all that light travels faster than sound A

it ＿to all that light travels faster than sound A It ( )that light travels faster than sound It's_common knowledge that light travels faster than sound My physics teacher said that light travels faster than sound As is known to us all,light travels much faster than sound. 1 It's common knowledge that light travels faster than sound My Paul said to us,'Light travels faster than sound.' Mr.Wang said to us,"Light travels faster than sound." What is known to us that the light travels faster than sound light travels about a million times faster than sound Light travels faster than sound改为过去式 Light travels much faster than sound.