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?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

Can you solve this picture maths equation?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What is more useful when it is broken?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?