The question of whether English will continue changing in the future is easy _______.

   A. answer         B. to answer        C. to be answered       D. answering

The question of whether English will continue changing in the future is easy _______.

   A. answer         B. to answer        C. to be answered       D. answering

The question of whether English will continue changing in the future is easy _______.

   A. answer         B. to answer        C. to be answered       D. answering

 The question of whether English will continue changing in the future is easy _______.

   A. answer         B. to answer        C. to be answered       D. answering

The question of _______ English will continue changing in the future is easy _______.

A. if; to be answered                B. whether; to be answered 

C. whether; to answer              D. If; to answer