What is always in front of you but can’t be seen?

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?

What is so fragile that saying its name breaks it?

It is always ahead of me yet I can never see it. What is it?

I taste better than I can smell. Who am I?

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

_ _ _ 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.

What runs around the whole yard without moving?

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