________ all the students in his class，Tom writes ________．

1. A.
   Of，most carefully
2. B.
   In，the most carefully
3. C.
   Of，very carefully
4. D.
   In，much more carefully

Tom is a good boy and he writes _________ in his class.

A. careful????????????? ????????????? B. the most careful????????????? ????????????? C. carefully????????????? ????????????? ????????????? D. the most carefully