1.Of all my teachers,Mr Smith is one who impresses me most.
one--the one
2.Although he is 40 and ordinary,but he looks very young.
去掉but
3.And he is one of the most popular teacher in our school.
teacher--teachers
4.Comparing with other teachers,he pays more attention to his way of teaching.
attention--attentions
5.He tries various ways make his classes interesting.
various---various of
6.In her opinion,we should not only know
"What",but also
her--his
7.understand "Why".So,instead of diving us answers immediate,
answers --answer
immediate--immediately
8.he encouraged us to think by ourselves when he puts forward questions
encouraged--encourages