Answer:
If you lose me, you may cause people around you to lose me too. What am I?
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
A little pool with two layers of wall around it. One white and soft and the other dark and hard, amidst a light brown grassy lawn with an outline of a green grass. What am I?
What goes all around the world but never leaves its corner?
You heard me before and then again. Afterward I die, until you call me again. What am I?
A little house full of meat, no door to go in and eat.