根据句意及首字母提示完成单词
This is the true story of the weeds: the o_______  of the species.
  Children of all ages should be o_______  several hours a day.
  We plan to expand our business a _______  in East Africa.
  If the ink sinks in the cloth,it'll be hard to r _______  the spot.
  He lost his b_______  and measured out his length on the ground.