Nurturer, Doctor, Engineer
In the conversation with his parents, Jonas reveals his nerves about assignments. His parents assure him that the Elders pay attention to each child and determine the best assignment based on the person's strengths and attributes. His father talks about his two friends which were assigned as Doctor and Engineer. In one instance his friend was surprised and in the other it was what his friend had wanted all along. We also know that some people are assigned as Laborers and that is not something Jonas wants.
Maya likes to swim in the ocean rather than swimming inside the pool
"We had passed through long walls of piled skeletons, with casks and puncheons intermingling, into the inmost recesses of the catacombs."
"We are below the river's bed. The drops of moisture trickle among the bones."
These are some sentences that give us the creepy setting that makes for an eerie mood.