One day, a man went on a journey, and took with him his horse and his donkey. He put a very heavy load on the donkey’s back, but nothing on the horse’s back. After a while, the poor donkey ___ the horse to help him. But the horse, who was very selfish, refused.

Further along the road, the donkey started to feel very tired, and again ___the horse to take some of the load. And again the horse ___. 

Finally, the donkey fell exhausted at the side of the road and died. So the man took the whole of the heavy load and put it on the horse’s back, together with the skin of the dead donkey, and they continued on their journey.

The correct words to fill in the blank are, respectively