Whoever invented______ wheel is believed to have made______ most useful invention in______ history.

1. A.
   a; the /;
2. B.
   the; the; /
3. C.
   the;. /; /
4. D.
   a; a; the.

Whoever invented______ wheel is believed to have made______ most useful invention in______ history.  

A. a; the /;           B. the; the; /                 C. the;. /; /                    D. a; a; the.

Whoever invented _______wheel is believed to have made ______most useful invention in _______history.

   A.a; the; /       B.the; the; /        C. the; a; /        D.a; a; the

Whoever invented ______ wheel is believed to have made ______ most useful invention in history.

A. a; the　　　　　 　 B. the; the　　　　 　　 C. the; a　　 　　 D. a; a

Whoever invented______ wheel is believed to have made______ most useful invention in______ history.