Good Riddles

Question: What is green and has wheels?

Question: It is able, but not capable.
It can stop, but not go.
It is dead, but not yet perished.
It's a ghost, but not paranormal.

Is it high, or is it low?

Question: It flies, it walks, it runs on land, It takes, it gives, but without hands, It carries and delights, Falls and frights. Normally a creature of white it is. What is it?

Question: An item looks square from outside, Circle when opened and Triangle when taken out.

Question: Two cops walk into a doughnut shop. One gets a sprinkle doughnut and the second one gets a sugar doughnut. What did the third cop get?