Forgetmenot said: "We had to sign a declaration solemnly undertaking not to visit Beijing and the country's north during this past summer, for 'security reasons'. We also had to put in writing that we were not to discuss politics and religion anywhere, inside and outside of classrooms."
Correction:you didn't have to sign such a declaration,you chose to do so. Go south,young man,as a poster called Alex posted previously,less backward there!