"Proverbs as finished by a fourth grade class" joke

Proverbs as finished by a fourth grade class:
It is always darkest...Just before you flunk a test.
There is nothing new...under a rock.
A journey of a thousand miles begins with...a private jet.
A committee of three...gets things done when they are not fighting.
If you can't stand the heat...try Antarctica.
Better late than...absent.
A rolling stone...may dent the floor.
If at first you don't succeed...live with it.
Laugh, and the world laughs with you. Cry...and then blow your nose.
A bird in the hand is....better than a woodpecker on your head.
Early to bed, early to rise...and you will get the best cereal.
Two heads...are pretty scary.
It is better to light a candle than...to light a bomb.
A miss is as good as...a mister.
A penny saved...is not a lot.
Don't burn your bridges...or you'll fall in the lake.
Haste makes...sweat