Fill in the blanks: The owner was ____________when he _____________that his expensive flower was eaten for lunch.

"Furious" means extremely angry, which fits the context of the owner's reaction."Found out" correctly conveys the moment of realization when he became aware of what had happened.Option 1 ("demented, find out") – "Demented" means insane, which is too extreme, and "find out" is grammatically incorrect (it should be "found out").Option 2 ("placid, get on") – "Placid" means calm, which contradicts the idea of being upset, and "get on" doesn't fit the sentence at all.Option 3 ("stewed, got on") – "Stewed" can mean angry in informal use, but "got on" does not logically fit the second blank.Thus, Option 4 is the best choice.