O_er_t_o_

Complete the missing letters of the given word.

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

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?

If eleven plus two equals one, what does nine plus five equal?

How many sides does a circle have?

How many letters are in the alphabet?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?