I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Can you solve below mathematical equation?

2^1234 - 2^1233

I have an eye but still cannot see.

Who am I?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Why do people go to bed?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?