Explanation: To determinate the rhyme scheme of a poem we need to pay attention to the ending sound of each line and we need to assign the same letter to similar sounds and different letters to different sounds. In the given poem, we have that the second and last lines end with similar sounds: "toes" and "knows" and the first and third lines end with different sounds: "bottom" and "end", and the second verse is also like that (second and last lines: "shy" and "spy" and the first and third lines are different: "bold" and "me"). So the rhyme scheme would be ABCB.
