The aircraft carrier is indispensable in naval operations against sea or shore based enemies.

Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

As tourism is more developed, people worry about the damage to the flora and fauna of the island.

Hypertension is one of the most widespread and potential dangerous diseases.

The situation seems to be changing minute by minute.

The bomb exploded in the garage; fortunately no one hurt.

We can use either verbal or nonverbal forms of communication.

It’s a really difficult matter to decide how to solve now. I will need time to think it twice.

The first few days at university can be very daunting, but with determination and positive attitude, freshmen will soon fit in with the new environment.

The raccoon is a nocturnal animal.

The systems caused by ingestion of a harmful chemical must be counteracted within minutes in order to avoid permanent damage to the kidneys and other vital organs.

He made one last futile effort to convince her and left home.

In the 1776 pamphlet "Common Sense," Thomas Paine defended the cause of the American Revolution.

He was fired because of his misconduct at the office party.

When being interviewed, you should concentrate on what the interviewer is saying or asking you.

Fallout from a nuclear power station damaged in the tsunami may endanger the vegetation.

The repeated commercials on TV distract many viewers from watching their favorite programmes.

The 1908 Siberian meteorite explosion brought about considerable depletion of the northern hemisphere's ozone layer.

Ask Mum for permission to go out now. She looks like she’s in a good mood.

We watched as the plane disappeared behind the clouds.

When we went to the airport to see her off, we had a traffic jam.