I often go roller skating in the park on weekends.

He is making a new road with a road roller.

I eat rice every day.

Close your eyes and take a deep breath.

He is playing a foolish character named Rho.

Chlorofluoromethane is one of the substances that contribute to the destruction of the ozone layer.

I love roller coasters.

Fluoromethane plays an important role in chemical reactions.

Chloromethane is often used in organic chemistry experiments.

Difluoromethane is widely used as a refrigerant.