Easy Riddles

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

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?

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 there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

I look at you, you look at me, I raise my right, you raise your left. What am I?

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?