It’s important that he_____ English well.

 Before he went abroad he spent as much time as he _____ English.

     A. could learning   B. learned      C. to learn       D. could learn

I demanded that he _____ English to help him improve it gradually.

. He _____ English for ten years by the time he takes the examination.

A. will have been studying                  B. would have been studying

C. will study                             D. studied