Answer:
What two letters in the alphabet say goodbye?
I am the red tongue of the earth, that buries cities.
You can have it, and be at it, But it never lasts forever.
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
Who plays when he works and works when he plays?
When is it bad luck to see a black cat?