Mr. Wang is a teacher. He ______ in this school for 20 years.

Mr Wang has taught English in this school ________ two years．

1. A.
   on
2. B.
   for
3. C.
   in
4. D.
   since

Mr Wang is well-known in this city ______ a writer.

1. A.
   like
2. B.
   as
3. C.
   for
4. D.
   of