Suddenly, he appeared in the room.

Database transactions need to ensure their atomicity.

The price of crude oil is rising.

I turned off the power of the laptop.

He likes to read the original book.

My collection of string instruments is large.

This pathogen is very dangerous to humans.

They have a lovers' quarrel almost every day.

He always quotes proverbs to teach us life lessons.

The cause of his lateness was a train delay.