Better late than.........................pregnant

Better to be safe than....................Punch a 5th grader
Strike while the .........................Bug is close
It's always darkest before............... Daylight Savings Time
Never underestimate the power of..........Termites
You can lead a horse to water but........how?
Don't bite the hand that................. looks dirty
No news is................................impossible
A miss is as good as a...................Mr.
You can't teach an old dog new............math
If you lie down with dogs, you'll.........stink in the morning
Love all, trust..........................me
The pen is mightier than the..............pigs
An idle mind is..........................The best way to relax
Where there's smoke there's...............pollution
Happy the bride who.......................gets all the presents
A penny saved is..........................not much
Two's company, three's....................the Musketeers
Don't put off till tomorrow what..........you put on to go to bed
Laugh and the whole world laughs with you, cry and.......you have to blow your nose.
None are so blind as......................Stevie Wonder
Children should be seen and not...........spanked or grounded
If at first you don't succeed.............get new batteries
You get out of something what you.........see pictured on the box
When the blind leadeth the blind..........get out of the way

And the favorite:

Better late than.........................pregnant