"Oh!" The startlement of realizing someone is lacking basic context you were taking for granted.

"No trees, you see. There are no trees on the Ninth--indeed, they are exceptionally rare anywhere but the Second."

"What organic materials we can coax from the ground or tanks of the Houses are for eating. Materials for synthetics can be harvested from gas giants, which are much more plentiful."

"I have seen only one proper paper letter in all my life, and that from the Emperor. Oh, and the Fifth showed off with a paper envelope for their dinner party," she adds. Her tone here is muddled; she wants to sneer but the Fifth are dead, so she settles for non-plussed.