We analyzed the data of the experimental group.

He is studying the major ethnic groups in that region.

This species has different characteristics depending on its subgroup.

He passed the medical school entrance exam on his first try.

He passed the difficult exam.

The Tertiary period was a very important time in the history of the Earth.

I like listening to Beethoven's Ninth.

He is good at playing Beethoven's Ninth.

This is my fourth attempt.

This is my second attempt.