Explanation:

- The passage describes an artist who is interacting with a painting. The blanks need to be filled with verbs that accurately describe actions related to the artist's experience.

- Option 1: appeared - Generally used to describe something coming into view or becoming visible. Not suitable here as it doesn't fit the context of the artist initiating an action.

- Option 2: arrived - Implies reaching a destination, often used for people or objects coming to a place. However, not ideal in this context as it doesn't match the implied sequence of the artist's actions.

- Option 3: reached - Often used to indicate arriving at a point or achieving something, but it doesn’t fit well with uncovering a canvas.

- Option 4: came - Best fit for the sentence. It suggests approaching or moving toward something, which aligns well with the artist going to the canvas.