Answer:
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
I am a cave full of bones and the house of a worm.
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
I am always coming but I never arrive. What am I?
The Titanic is still here.
When is it bad luck to see a black cat?
What am I?
Animal
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Easy
Food
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Logic