Answer:
When will water stop running down hill?
What object has keys that open no locks, space but no room, and you can enter but not go in?
Meat that has been cured by being cut into long, thin strips and dried
What has ten letters and starts with gas?
Each morning I appear to lie at your feet, all day I follow no matter how fast you run. Yet I nearly perish in the midday sun.
I build up castles. I tear down mountains. I make some men blind. I help others to see.