music: 60's Chart Toppers: Name The Artist: Dancin' Party?

Questions

"If we don't ----------, we run the risk of failure."- J. Danforth Quayle?

"The hardest job kids face today is learning ------------ without seeing any."- Fred Astaire?

"The hardest thing in life is to know which ---------- to cross and which to burn."- David Russell?

"If we knew what it was we were doing, it would not be called ------------, would it?"- Albert Einstein (1879-1955)?

"The hardest thing to understand in the world is the ."- Albert Einstein (1875-1955)?