What you cannot hold but it is yours?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What Does this text mean:

important=important

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What have one eye but still cannot see?

what does the below rebus mean?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?