She learned new words and their antonyms.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

This rock contains cassiterite.

I have been to Wuxi.

He wrapped the sandwich in tinfoil.

Transition metals play an important role in chemical reactions.

This bottle is reusable.

Who is the user of this software?

When he opened the door, a metallic sound echoed.