Riddle #171

Question: You put me in hard.
But then I become soft.
Blow me hard and I will get bigger.

What am I?

Question: What do you call a sad bird?

Question: What has a bed that you can't sleep in?

Question: Where do all the letters sleep?

Question: How are doughnuts and golf alike?

Question: What cannot be seen or felt, but can only be broken by voice?