We shold try to ___ every custom or tradition which is in danger of dying out a . collect b . preserve c. act out d . make A large number of enthnic people in the moutains are still___. They can't read or write a . traditional b . poor c . tradition d . illiterate Vietnamese people follow the __ that elderly grandparents and parents are taken care of by their children until they die a . behavior b . pratice c . custom d . tradition