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

How can you leave a room with two legs and return with six legs?

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

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

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?

I have eight fingers and two thumbs but I do not live. What Am I?

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

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. 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?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?