Answer:
What occurs once in a minute, twice in a moment and never in one thousand years?
Without this, H2O would just be 2O
What is something that can go up quite easily, but is not as easy to bring back down?
What time of day, when written in a capital letters, is the same forwards, backwards and upside down?
What do you have in December that you don't have in any other month?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.