Dr Brown has the habit of _____ the room when  he is thinking about something troublesome.

A. pacing B. stepping C. walking D. marching

Dr Brown has the habit of _____ the room when  he is thinking about something troublesome.

1. A.
   pacing
2. B.
   stepping
3. C.
   walking
4. D.
   marching

 Dr Brown has the habit of _____ the room when  he is thinking about something troublesome.

A. pacing                     B. stepping            C. walking             D. marching

 Dr Brown has the habit of _____ the room when  he is thinking about something troublesome.
A. pacing                  B. stepping            C. walking             D. marching

Dr Brown has the habit of _____ the room when  he is thinking about something troublesome.
A. pacing  　　 B. stepping  　　　　C. walking  　　　　D. marching