I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you find the missing piece of the Porsche?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

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?