Answer:
People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?
Bright as diamonds, loud as thunder, never still, a thing of wonder. What am I?
What is the most slipperiest country in the world?
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
I am owned by every man though my length differs. Their wives uses me after getting married.
What did the grape do when he got stepped on?