After three days
You can chang it to: Upon the fourth day of arriving
differences .So I knew I
difference so I knew...
i had a volunteer job in a Brooklyn Library during the 2010 summer to Sep 2010
I volunteered at the Brooklyn Library from the start of my 2010 summer until the start of the school year.
My favorite community service is to work in a church when I was a junior; i worked 4 hours per week. The church lets teenagers design some shows and posters for Christianity.
In my junior year, i volunteer at a church where i was able to design some show's posters.
-You should leave out the hours per week because in the extracurricular activity part of the app already states it.
You have to revise the 3rd paragraph because its quite confusing, especially the assigning task part.