Answer:
What word becomes smaller when you add 2 letters to it?
What is it that given one, you'll have either two or none?
As strong as love, more dangerous than cancer.
Retired people want these to be large and birds want them to hatch.
What has no hands but might knock on your door, and if it does you better open up?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?