Answer:
Man walks over, man walks under, in times of war he burns asunder. What is it?
You cannot keep me until you have given me. What am I?
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen. What am I?
I am a word. I become longer when the third letter is removed. What am I?
Everyone asks for me but yet everyone hates to face me. For someone I am agony, for others I am relief! What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.