How do you score on these 3 riddles?

How do you score on these 3 riddles?

2017-08-10 Off By The Nomadness Team
  1. How do you make the number one disappear by adding to it?

Add the letter ‘G’ and it becomes Gone

2. A boy fell off a 100 foot ladder. But he did not get hurt. Why not?

He was only on the first step

3. What invention lets you look right through a wall?

                                             A window