Riddle #1050

Slayer of regrets, old and new, sought by many, found by few. What am I?

Two sisters we are, one is dark and one is fair, In twin towers dwelling we're quite the pair, One from land and one from sea, Tell us truly, who are we?

I am a 5 letter word. Take away the first letter and I am a country's name. Take away the first two letters and I become the opposite of the 5 letter word. Who am I?

I soar without wings, I see without eyes. I've traveled the universe to and fro. I've conquered the world, yet I've never been anywhere but home. Who am I?

I have just one, but with eight to spare, I am usually friendly, but I sometimes act like I don't care. What am I?

I eat other animals. I have a big mouth. I am green. I live in the water. Who am I?

On the first day of the school a young girl was found murdered. Police suspect four male teachers and question them. They were asked what they were doing at 8:00 am. Mr. Walter: I was driving to school and I was late. Mr. Thomas: I was checking English exam papers. Mr. Benjamin: I was reading the newspaper. Mr. Calvin: I was with my wife in my office. The police arrested the killer. How did the police find the murderer?

Until I am measured I am not known. Yet how you miss me when I have flown.

I visit you every night even if you don't call me. I'm lost every day. What Am I?

I am there when you are quiet. I am broken when you speak. Who am I?

You can hold it without seeing or touching it! What is that?