Chemical pollution has a serious impact on the health of the Earth.

This shirt is made of chemical fiber.

His lie was clearly evident.

Her dress was pure white and it was very beautiful.

Her eyes were shining like amber.

I often go to the museum to study natural history.

He is working hard to complete his doctoral dissertation.

He is a famous earl in England.

He received a letter of threat.

He threatened me and forced me to reveal the secret.