Answer:
What has a head yet it never weeps, has a bed but never sleeps, can run but can not walks, and has a bank but not a cent to its name?
What is the middle of water but is not an island?
What occurs four times in every week, twice in every month, only once in a year but never in a day?
They are two brothers. However much they run, they do not reach each other.
What has a foot but no leg?
When is it bad luck to see a black cat?