Put the correct preposition from the following list.

from, in, with, between, of, at, to, on
1)The teachers _______ the school are very young.
2)Dan goes _______ a secondary school.
3)He`ll probably pass ______ good marks.
4)Betty is a teacher ______ English.
5)Her pupils are _________ 12 and 18.
6)She is very strict _______ them.