Good Riddles

Question: What's strong enough to smash a ship but is still afraid of the light?

Question: I live in your house yet, you do not love me. I eat your food, yet you squeal in fright at the sight of me. What am I?

Question: When is the hardest time to catch a frog?

Question: You have bag, you put a lump of metal into the bag, then you put a lama into the bag, then you put something else into the bag, and yet the bag weighs nothing. Why?

Question: I can be one, I can be two. I can be Open, Closed, Empty or Full. I can be Bare, but never a Bear. What AM I??