Can you write down eight eights so that they add up to one thousand?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

What jumps when it walks and sits when it stands?

If you say my name, I will no longer exist. What am I?

O_er_t_o_

Complete the missing letters of the given word.

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

John was piloting a plane behind a car but was never able to overtake it. Why?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

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