Can you decipher the two rows to find the hidden word?

Replace the question mark in the picture below.

Which alphabet is a part of our body?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

A Miser man decided to go on a vacation for a month. He goes to the bank and asks for a trip loan of $500. The bank officer asks the man that the loan can only be approved when he mortgage some valuable thing at the bank. Miser man mortgages his only car whose worth was a whopping $80000. The Bank officer laughed at him and approve the loan instantly. After vacation when the miser man returns, the bank officer asked him "Are you an idiot, why is your mortgage such an expensive car for such a short loan?".

Miser man replied with some reason and the bank officer agreed that the miser man is actually not an idiot.

What did miser man reply to the bank loan officer?.

If eleven plus two equals one, what does nine plus five equal?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What seven-letter word has hundreds of letters in it?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n