Best riddles with simple answers

I can sizzle like bacon, I am made with an egg, I have plenty of backbone, but lack a good leg, I peel layers like onions, but still remain whole, I can be long, like a flagpole, yet fit in a hole. What am I?

What country makes you shiver?

Can you write number 45 using only the number 4?

What do you call a zipper on a banana?

It is a city that has no people! What is that?

You are in a cold house in the winter. It is dark. You have one match. There is a candle and there is a wood burning stove. Which do you light first?

Where did the sheep go on vacation?

You can easily touch me, but not see me. You can throw me out, but not away. What am I?

I weigh almost nothing. I am lighter than air. But even the strongest man in the world cannot lift me. What Am I?

Some months have 30 days, and some months have 31 days. How many have 28?