What is this?
It's a spider.
What are these?
They're treats/candies/sweets.
What are these?
They are costumes.
What is this?
It's a bat.
What is this?
It's a potion.
What is this?
It's a broom.
What is this?
It's a skeleton.
What is this?
It's a monster.
What is this?
It's a witch.
What is this?
It's a pumpkin.
What is this?
It's a ghost.
What is this?
It's a black car.
What is this?
It's a mummy.