what competitions did fumio imamura compete in that contained the word world?
world race walking cup, world championships, world championships, world championships, world championships, world championships, world championships, world championships
of these which ones did he place outside of the top 10?
world race walking cup, world championships, world championships, world championships, world championships, world championships
in what venues of those were in north america?
san jose, united states, edmonton, canada
what was his best placement of those?
12th