Who's Driving the Tractor?

Putt-putt-putt! Brum-brum! " What is that sound?" asked Cow.

Brum-brum-brum! Brum-brum! " I think it's Farmer's tractor, " said Bat.

" It can't be Farmer's tractor, " said Cat. " Farmer went to town. " " Nobody else drives the tractor, " said Dog.

Putt-putt-putt! " It is the tractor, " said Bat. " But Farmer is not driving it! "

" Who is driving it?" asked Dog. " Pig! " said Bat.

" Pig?" said Dog and Cow and Cat. Everyone ran outside.