To St. Ives

I make you weak at the worst of all times. I keep you safe, I keep you fine. I make your hands sweat, and your heart grow cold, I visit the weak, but seldom the bold. What am I?

What can bring back the dead; make us cry, make us laugh, make us young; born in an instant yet lasts a life time?

What is it the more you take, the more you leave behind?

A black dog stands in the middle of an intersecton in a town painted black. None of the street lights are working due to a power failure caused by a storm. A car with two broken headlights drives towards the dog but turns in time to avoid hitting him. How could the driver have seen the dog in time?

When can you add two to eleven and get one as the correct answer?