Short Riddles and Answers

Question: I have keys but no lock, you can enter but not leave what am I?

Question: There are 30 cows in a field and 28 chickens....how many didn't?

Question: What laughs while stalking prey, but never goes in for the kill?

Question: what goes in your mouth hard and dry and comes out wet and soft?

Question: I'm above your head every where you go and i'm blue. What am I?