Answer:
You use a knife to slice my head and weep beside me when I am dead.
I beam, I shine, I sparkle white. I'll brighten the day with a single light. I'll charm and enchant all. I'll bring the best in you all. What am I?
I plow and plow but never sow.
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.