How to teach SS to think??

One of my colleagues says, "Damn!! our students don't use their brains." It's tough to teach SS how to think critically or creatively. Since it seems that the teachers do nothing in the class if let them think & do by themselves!! On top of that, the SS have been passive learners throughout their primary and secondary life. It takes time to change their learning styles.  What should I start in order to unlock their mind???