There is a test in two days.

There are two rooms in my house.

There are two rooms in my house.

I created two characters.

My younger sister is twenty-two years old.

Radioactive elements are produced in nature and scientific experiments.

Global warming is a big issue that affects all of us.

He is an expert in geophysics.

He believes in the geocentric theory.

A terrestrial planet may have an environment similar to Earth.