Find the error in each statement and correct it

Find the error in each statement and correct it.
1.     I saw Cristina yesterday. She studied in the library.
2.      If I felt no fear, I will not want to be left on my own.
3.      His parents were having high expectations when he was studying at university.
4.      I’m sorry, I wasn’t hearing what you said. I was reading this article for my essay.
5.      The long term consequences have not yet discovered.
6.      The woman felt no fear was of great interest to researchers.
7.      The volunteers on the street stop criminals from commit crimes.
8.      The organization encourages local people watch out for each other.
9.      The volunteers hope to prevent crimes from happen.
10.  The disease who is very rare affects the brain.