Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
Doing this with your job can be risky but doing it with smoking is always a good idea
Who plays when he works and works when he plays?
If you agree give me one of these.
The land was white the seed was black. It'll take a good scholar to riddle me that.
I am a rock group with four members. All dead one was assassinated.