1. Words adoptive = to become parent of a child that isn't your own claim

commemorative service = event that shows you remember and respect something important that happened a long time ago

crew = all the people who worked on the sub

decade = ten years

disappear = here: to get lost

discover = here : find

enemy fire = attack by the enemy

examine = look at something closely in order to find out more about it

government - funded = paid for by the state

in one piece = not broken

loss = not having something anymore

mission = important job, done by the army, air force or navy

naval = about the navy

navy = part of a country's military that fights at sea

occupy = to enter a place with an army and keep control of it

official = here: a person in a high position in an organisation

prove successful = if something you try to do really works the way you want it to

submarine = ship that can stay underwater for a longer period of time

well-preserved = in good condition

wreck = a ship that has sunk

4.Words

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  abuse = using something in a way that you shouldn't
  
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  according to = as reported by ...
  
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  addict = someone who is not able to stop taking drugs
  
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  as a consequence = this results in; it leads to
  
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  average = normal
  
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  brain = organ in your head that control your thoughts, feelings and movements
  
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  cancer = very serious illness in which cells in your body grow in an uncontrollable way
  
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