What always comes into a house through the keyhole?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

What has 88 keys?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

There are 3 apples in the basket and you take away 2. How many apples do you have now?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

What has one eye, but can’t see?