Stop!

You can't have:

A drip without a drop

A plip without a plop

A rabbit without a hop

Karate without a chop

A fizz without a pop

A flip without a flop

A bottom without a top

A city without a shop

A cleaner without a mop

An exchange without a swap

A surgeon without an op

A skinhead without a crop

A police car without a cop

Or a start without a...STOP!