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A polite teacheris better..but sometimes you have to be a little strict..
A polite teacher can easily be strict when necessary
So, it is OK to be both - look at me, for example)))
The obvious answer would be to have a combination of the two!! I feel that other than that you will find it difficult to come to any form of conclusive decision on which option would be better, simply because, as we know, human beings are all different, an approach which works for one will not work for another. If we were all as good as Denis life would be so much easier!!!!!!!!
Strict when it is necessary and polite the rest of the time.
What is the role of a teacher in scientific age when instructions can be carried out with gadgets available around us?