Seen Riddles

Can't Be Seen, Can't Be Felt
Riddle:
It can't be seen, can't be felt, can't be heard and can't be smelt. It lies behind stars and under hills, and empty holes it fills. It comes first and follows after, ends life and kills laughter. What is it?
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Always in front of you but can’t be seen
Riddle:
What is always in front of you but can’t be seen?
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