Easy logic riddles with simple answers

I have a little tail. My nose is called a snout. I live on a farm. I can say, "Oink-oink" I am a...

You saw me where I never was and where I could not be. And yet within that very place, my face you often see.

What building has the most stories?

Wash it and it isn't clean. Don't wash it and then it's clean. What I Am?

When does Halloween come before Valentine's day?

When you don't have me, you want me, but when you do have me, you want to give me away. What am I?

Four children and their pet dog were walking under a small umbrella. But none of them became wet. How?

Johnny‘s mother had three children. The first child was named April. The second child was named May. What was the third child‘s name?

Which vehicle is spelled the same forwards and backwards?

I am a nut with a whole. What am I?