You ________ improve your English, or you can't catch up with others．

1. A.
   need
2. B.
   need to
3. C.
   don't need
4. D.
   don't need to

--  do you improve your English ?
--I improve it    practicing it more often.

_____ wonderful your English is! Can you tell me how to improve my English?

—_______ do you improve your English?

—I improve it _______ reading aloud.

A. How; with     B. How; by          C. What; with     D. What; by