His blackboard work is a strong feature of his teaching with the result that his class makes definite advance as a result of his teaching .
He is a vigorous teacher , his questioning being good and plentiful and he makes good use of the answers he receives .
teacher 's blackboard work is a strong feature of his teaching with the result that his class makes definite advance as a result of his teaching .
He is a vigorous teacher , his questioning being good and plentiful and he makes good use of the answers he receives .