1- Friends play ( 加上an ) important role in everyone's life.
2- Friendship usually developed (改为develops) during childhood.
3- Friendship usually develop during (改为 since) childhood.
4- friends are made because you progress through(改为at) school.
5- those friends you make as a student can be(去掉be) last long.
6- Friend (改为Friends) have a great influence on your behavior.
7- if you go in to (in to 改为into) sports,nost of your friends probably like sports.
8- So are (do) most of your friends.
9- true friends are most (very) specially and difficuit to find.
10- so that is which is (去掉which is) really lucky for you if you have a true friend.