Years of civil war have 'drained' the country 'of' its resources. [=have used up the country's resources]
Nothing has been done to stop the 'brain drain' as more and more doctors move away from the area.
When the beans have cooked long enough to be tender, 'drain off' the water and set them aside.
(..) I'd try putting it in the water if I were you. Myrtle! Hello, Harry. Long time no see. I was circling a blocked drain the other day... ...and could swear I saw a bit of Polyjuice Potion. Not being a bad boy again, are you, Harry? (..)2005 Harry Potter and the Goblet of Fire