Her explanation was vague and unclear.

This alien culture is fascinating to learn about.

There is a growing inequality between the rich and the poor in our society.

He is a dedicated communist.

Wheat is a staple crop in many countries.

She is politically active and often participates in protests.

The artificial intelligence industry is rapidly growing.

I need to use a comma in this sentence.

The navy deployed a sub to search for the missing submarine.

The occurrence of the event was unexpected.