UnScramble this Word: u n o a c g l j?

Questions

"If we don't ----------, we don't grow. If we don't grow, we aren't really living."- Gail Sheehy?

"The harder you --------, the luckier you get."- McAlexander?

"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?