Put the words in the correct group.

• Группы
  • Opening stages
  • Middle stages
  • Final stages
• Варианты
  • firstly
  • first of all
  • in the first stage
  • in the next phase
  • then
  • the next stage
  • after this
  • next
  • subsequently
  • finally
  • in this final stage
  • at the end
  • in the last stage