A father isn't happy with his only son. He doesn't think his son is clever. One day, the father gives his son a task. He says, here is a coin. Go to buy one thing. That must be something to eat, something to drink, and something to plant. "What can I buy with one coin? It is too hard!" Then a girl finds the boy is not happy and comes up to him. "Can I help you? " The boy tells her that hard task. "I know what you can do, " she says. "Go and buy a watermelon with this coin. " It will give you everything your father wants." The boy thanks the girl and then runs to buy a watermelon. When the father sees the watermelon, he is very happy. "Good Job!" "In fact, that's not my idea. A girl helps me", says the boy. The father then says, " _ is more important than cleverness." ,. The boy thinks about what his father says, but he still doesn't know   _  .
where to buy it what to buy how to buy it why to buy it