Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

A man dies of old age on his 25 birthday. How is this possible?

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

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Different lights make me strange by changing me into different sizes. What am I?

What is the word or phrase?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

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