The centre of the third figure is empty. What digit should fit inside?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

What jumps when it walks and sits when it stands?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

What do you call a fish without an eye?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

What runs around the whole yard without moving?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

What has one letter and starts with an E?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.