Answer:
2 in a corner 1 in a room 0 in a house but 1 in a shelter.
I have three heads. Cut off one I become stronger. Cut off two I become ten.
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
I am an activity involving pins flying in the air.
you hold my tail while I fish for you
The warmer I am the fresher I am.