Solutions: 

Witches fly on broomsticks. / Witches travel on broomsticks.

Vampires turn into flying bats. / Vampires change into flying bats. / Vampires transform into flying bats.

Vampires like blood. / Vampires crave blood. / Vampires drink blood.

Werewolves howl at the full moon. / Werewolves growl at the full moon. /Werewolves bay at the full moon.

Ghosts haunt old houses and ancient castles.

In stories, monsters hide under the bed. / In stories, monsters crawl under the bed. /  In stories, monsters lay under the bed.

Fog drifts over the graves.  / Fog hovers over the graves. / Fog lingers over the graves.

The leaves drift in the wind. / The leaves rustle in the wind. / The leaves fly in the wind.

On Halloween, children carve orange pumpkins. / On Halloween, children smash orange pumpkins.

Children often wear costumes on this day. / Children often put on costumes on this day.

Children go from house to house to get candy.  / Children travel from house to house to get candy.

Children say, �Trick or Treat!� / Children shout, �Trick or Treat!� / Children yell, �Trick or Treat!�

Mummies are covered in bandages. / Mummies are wrapped in bandages.

Frankenstein is usually green. / Frankenstein was usually green.

Do not eat any candy unless it has been checked first!

What will you wear for Halloween? / What will you be for Halloween? / What will you do for Halloween?

The candle flame flickered in the breeze. / The candle flame quivered in the breeze. / The candle flame moved in the breeze.

The old brown owl said, �Hoo.  Hoo.�

My favorite part of Halloween is the candy! / My favorite part of Halloween was the candy!

The scariest costume I ever saw was a skeleton.

The spider quickly crawled to its� web.  / The spider quickly sprang to its web. / The spider quickly scurried to its� web.

Ugly witches are usually green with warts. / Ugly witches were usually green with warts.

Do not go to darkened houses alone!  Travel with friends.

Halloween is scary for children. / Halloween can be scary for children.

The tree looked weathered and thin. / The tree appeared weathered and thin.

The door creaked as it opened. / The door squeaked as it opened.  / The door groaned as it opened.

When the skeleton moved its bones rattled. / When the skeleton ran it�s bones rattled. / When the skeleton moved its bones shook. / When the skeleton moved its bones clattered.  Etc.

Ghosts are chasing me! / Ghosts were chasing me!

(More answers are possible, but these are what I came up with in a hurry.)

Pinky