Lens is part of Camera. you are likely to find Camera in/at/on Drawer. you are likely to find Jeans in/at/on Drawer. you are likely to find Jeans in/at/on Bedroom. 
Sack is the opposite of Hire. Engage is a type of Hire. Engage is a synonym of Agree. 
Lens --PartOf--> Camera --AtLocation--> Drawer <--AtLocation-- Jeans --AtLocation--> Bedroom 
Sack <--Antonym--> Hire <--IsA-- Engage <--Synonym--> Agree 