Answer:
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
I shrink smaller every time I take a bath. What am I?
I am made by nature soft as silk; A puffy cloud white as milk; Snow tops this tropical crop; The dirtiest part of a mop.
I know a word of letters three. Add two and fewer there will be. What is the word?
A large oasis in the desert. Come with cash and leave with none.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.