阅读下面短文，掌握其大意，然后从 21～40 各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。
My father was a self-taught mandolin（曼陀林琴）player. He could not read, but if he heard a tune several times, he could play it. Occasionally, he ___21___ play for the local radio station.
Dad loved playing the mandolin for his family. He knew we enjoyed his playing. If he could give ___22___ to others, he would, especially for his family. He was always ___23___ his time and efforts to making sure his family had enough in their life.
