Which quote provides the best example of a comparative structure?

“By the end of the second week, in fact, the fairies had covered the entire plot with footprints. At last they gave up and let the woman live.”
“When he had learnt them thoroughly he could return to her and she would give him more lessons in hunting. Leopard obeyed.”
“At one time leopards did not know how to catch animals for food. Knowing that the cat was very [skillful] in this way . . .”
“In the middle of the night the leopard arrived. He went first to the chief’s hut but when he saw the fire, he crept away.”