The fire doors of this building must always be kept closed.

He defeated the enemy with a metal rod.

He embarked on a new adventure.

He took a big risk to start a new business.

He ruined his health because of his gluttony.

He overate due to stress.

Last night, a large-scale riot broke out in the city.

We should do our best to defend our country.

The death of this civilization is inevitable.

This civilization is on the verge of extinction.