What is the main ingredient of this dish?

This painting is still incomplete.

He has expertise in computer science.

He is well acquainted with Japanese.

The Tangut script was used in the Western Xia Dynasty in China.

His voice sounded very gentle.

He is a disciple of a famous painter.

He lent the textbook to the underclassman.

He is working on the production of a new movie.

The Long March was an important event in Chinese history.