Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

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

What goes up but never comes down?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What is always in front of you but can’t be seen?

What runs around the whole yard without moving?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

What do you answer even though it never asks you questions?