I choose the sentences "Robert´s black cat only eats expensive food" and "The cat is white, but it is picky" from the Adjectives of the Parts of Speech because I want to highlight the importance of different uses of those words and how they describes/shows the information in the sentence.
Like the sentence in the excercise of the museum: "The red fox jumps over the dog", we have to be careful and do not be confuse between the other Parts of Speech.