What is at the end of a rainbow?

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

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

_ _ _ 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 belongs to you, but other people use it more than you do. What is it?

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

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

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

What do you answer even though it never asks you questions?