You cannot keep me until you have given me. What am I?
word
I build up castles. I tear down mountains. I make some men blind but I help others to see. What am I?
sand
What is always coming but never arrives?
tomorrow
I cannot be burned in fire or drowned in water. What am I?
ice
I sleep by day I fly by night. I have no feathers to aid my flight. What am I?
bat