Answer:
I am an odd number. Take away a letter and I become even. What number am I?
The warmer I am the fresher I am.
If a plane crashes on the border of US and Canada where do they bury the survivors?
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 stay where I am when I go off. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.