As you said

Just like what you said,pupils are more willing to answer questions in class.

But if we want to get into university,we have to go through the junior school and senior school.Teachers in senior school wish us,educate us,force us to keep in slience.They would say "why do you talk so garly?why not keep silent ?"They  want us to work like an old man who just have the ability to sit,think and write.They would say "it is good for you all, it is necessary for you all!"

Nevertheless,when we get into the university.Teachers may asked"What's the hell?why do you always keep silent ?why not talk ?"Maybe in their eyes,we just like dead men hasn't been buried.It's so funny!

Six years or even three years are enough to change a person.It is education that makes us what we are today,not just school education,but also family education.We may need another three years even longer to learn to talk and speak.^_^