There are 30 students in my class.

His life took a sudden turn for the worse.

The situation changed all of a sudden, and we couldn't do anything.

The durability of this product is very high.

He has nine apples.

I am surprised at the quickness of this project's progress.

Earth science is an important field of study for unraveling the mysteries of nature.

He is a world-renowned researcher.

When the earthquake occurred, he took emergency measures.

This love will continue eternally.