I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

What word begins and ends with an E, but has only one letter?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

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

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

Explain?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

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?

I’m orange, I wear a green hat and I sound like a parrot. What am I?