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

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

Can you name some countries which do not have the alphabet 'A' in them?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?

I have teeth but i don't bite. Who Am I ?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

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

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?