Read and choose the best answer. 阅读短文，回答问题。

Miss Bird is going to have a singing party on Saturday. The duck says, "I can't sing well. Who can help me?" Miss Bird tells him, "Practice makes perfect."(业精于勤). So he practices (练习) and practices. The bear asks him to play football. But he says, "Sorry, I can't. I want to practice the song". The rabbit invites him to a birthday party. But he says, "Sorry. I want to practice the song". The cat invites him to watch TV in the evening. But he says, "Sorry. I need more practice." Today is Saturday, the duck sings very well at the singing party. In the afternoon, the dog says, "I will go swimming. Will you go?" The duck says, "Of course! (当然可以)"