Short simple riddles

What is the largest number you can write with just 3 digits?

I have all the knowledge you have. But I am small as your fist that your hands can hold me. Who am I?

My best buddy always makes mistakes. But I would easily get rid of the mistakes. What Am I?

What goes up when rain comes down?

They are twin sisters, same height; they work in the kitchen, arm in arm. Whatever is cooked, they always try it first.

What is everthing yet nothing, has no start and no end, creates yets destroys, brings life and death what is it?

I have a face like a tree and skin like the sea. A great beast I am, yet small vermin frighten me. What am I?

I'm a soft and furry pet. I have four legs and a long tail. I have sharp teeth and claws. I like to chase mice. I am a...

If you were swimming in the ocean and a big alligator attacked you, what should you do?

You have to look at me to say what I show you. I offer two different purposes but I am spelled the same and I am pronounced the same.