The students in our school are encouraged to _______ their own opinions about any school rules and require the authority to give them reasonable explanation, which is helpful to develop their critical thinking.
Though they may know their parents are right, teenagers sometimes tend to _____ act against their parents’ wishes because they hope to get away from the control of them.
Compared with the generation of our grandparents, who grew up in an age when people were _____ in almost every kind of materials, we should be content with the abundant supply.