I'm sorry you're having trouble getting answers in email; is there any other way you can contact these people? I know I have 6-10 email addresses and don't get to all of them as often as I "should". Some of them I have set up for special reasons and I don't work on that project as much as others. If they're professors/teachers/tutors, I'm sure they probably have a zillion other students emailing them too as well as their regular work they do so it might take some time to get an email, like getting an assignment graded/returned.

I hope you hear soon though! From somebody