Mr. Tan is my best friend.

He started a fire using coal.

He is drawing a picture using charcoal.

The government is considering the introduction of a carbon tax.

He was infected with anthrax.

Carbon is one of the basic elements of life.

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

He directed us to the right path.

She is beautiful in her unadorned state.

I paid my taxes for this year.