Carbon dioxide is one of the main causes of global warming.

Carbon monoxide is a colorless, odorless gas, and it is dangerous to inhale.

I found an old box in the storeroom.

She felt the pathos of things when she saw the cherry blossoms falling.

What is this object?

Zoo staff must clean up the animals' excrement every day.

I am thinking about what to make her birthday gift.

This animal is a protected species, so you must never touch it.

The police found an explosive substance at the location.

He was reading a true account of the incident.