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

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

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

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

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?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

O_er_t_o_

Complete the missing letters of the given word.

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?