Using Only Five 5's and any mathematical operator make sum as 37

Do You See It?

Name a key which is hardest to turn.

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What number should come in place of the question mark below?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

What number divided by 4 is the same as that number minus 4?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.