What is so fragile that saying its name breaks it?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

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 will you call your mother's brother's brother-in-law?

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

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

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

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What can you catch but never throw?