Answer:
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
I am a food with 5 letters. If you remove the first letter I am a form of energy. Remove two and I'm needed to live. Scramble the last 3 and you can drink me down.
I am the beginning of the end and the end of time and space. I am essential to creation and I surround every place.
I am used for light yet I am solid. Without me you would feel enclosed. I hate being touched especially with a lot of force. I like to be in buildings.
Never ahead, ever behind, yet flying swiftly past; for a child, I last forever; for an adult, I'm gone too fast. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.