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

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

The dirtier I get, the whiter I look. Who am I?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag