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It could be a serious problem.

This is a serious mistake.

I made a serious mistake.

Tom made a serious error.

Drunk driving is a serious problem.

The population explosion is a serious problem.

Getting married is a serious matter.

He made an important discovery.

It's not a serious mistake.

He committed a serious crime.

The president has grave responsibilities.

I am charged with an important mission.

She made a serious mistake.

The international situation is becoming grave.

We are fully aware of the importance of the situation.

The negotiations stepped into a crucial phase.

It has an important influence upon our lives.

Carelessness can lead to a serious accident.

The town water supply was seriously obstructed by heavy rainfalls.

The atomic bomb is a grave threat to mankind.

The police considered the crime to be serious.

She indicated that the problem was serious.

That doctrine will no doubt lead to serious consequences.

Loss of health is more serious than loss of money.

He showed courage in the face of great danger.

You are not excused from the responsibility for this serious situation.

The municipal council all but ignored the gravity of the pollution.

As today's accident is very serious, I take it seriously.

Scientists regard the discovery as important.

This kind of bomb is a serious menace to mankind.

The discovery will have a momentous effect on the treatment of cancer.

President Bush gave an important address on TV and the radio yesterday.