________ at the end of next month, the gymnasium is being built day and night by the construction workers．

1. A.
   Completed
2. B.
   To be completed
3. C.
   To complete
4. D.
   Completing

         at the end of next month, the gymnasium is being built day and night by the construction workers.                                       

A. Completed        B. To he completed   C. To complete     D. Completing