I think "hit" is better. When people say someone is crashed, they usually mean that person is overwhelmed or extremely sad.

Paper

Paper is versatile and convenient.
The product has become pervasive in many aspects of our lives.
For example,we take notes at work.
We usually convey something written on the paper to someone.
It is almost impossible not to use paper for one day.
Before the invention of paper, people used baｍboo and silk instead of paper.
However, they were unwieldy.

I think Molly is a beautiful name!

good luck on your research : )

想知道遇到了什麼奇葩事 :3

Are you trying to say that you're choosing this major because you wanna be successful? I've heard from many people (including admission officers) that, when asked about the reason why you choose certain major, do not mention money and try not to mention "success."

"Dessert" is better. I don't hear people say "desserts" when asking this question.

It depends on what you're trying to say. Is it still being spread now? Is so, use "has been spreading."