她创作了一首优美的乐曲。

She composed a beautiful ___piece of music.

音乐会将演奏一首为弦乐四重奏创作的新作品。

The concert will feature a new ___piece for string quartet.

昨天的报纸上有一篇关于替代医学的有趣文章。

There was an interesting ___piece on alternative medicine in the newspaper yesterday.