Answer:
I hold two people together but touch only one. What am I?
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
I can wake you up in the morning but I require no electricity or winding. What am I?
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
I work when I play and play when I work. What am I?
When is it bad luck to see a black cat?