What is so fragile that saying its name breaks it?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

What English word has three consecutive double letters?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

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

What has 88 keys?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

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