Answer:
Tuesday, Sam and Peter went to a restaurant. After eating lunch, they paid the bill. Sam and Peter did not pay. Who did?
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
What is full of holes but still holds water?
As a state in the USA, I am round on both sides and high in the middle. What am I?
What is always coming but never arrives?