They (referring to women or girls) are my best friends.

The birthrate in Japan is decreasing year by year.

He traveled to the farthest extreme of the earth.

Lahti is a beautiful city in Finland.

He was staring at the shore.

This area is rich in limestone, forming beautiful landscapes.

This area is covered with layers of limestone.

This factory produces cement, which has calcium oxide as its main component.

Please cut the paper along this incision line.

I appreciate his prompt correspondence.