Many have heard me riddle

Question: Many have heard me, but nobody has seen me, and I will not speak back until spoken to.What am I?

Question: What fish only swims at night?

Question: What kind of mouse does not eat, drink or even walk?

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

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?