The yearly growth of the gross national product is often used as an indicator of a nation's economy.

Many scientists agree that global warming poses great threats to all species on Earth.

Those companies were closed due to some seriously financial problems.

John stayed at home from work yesterday because he was feeling under the weather.

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

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

If people’s interference with the environment decreases, more species will survive and produce offspring.

At last, we succeeded in persuading those boys and girls to join our picnic.

This quartet of extraodinarily talented musicians generated a phenomenal number of pieces that won gold records.

It is really incredible that he is unaware of such basic facts.

Our parents join hands to give us a nice house and a happy home.

I am sure that they will be sacked on the spot.

Don't be concerned about your mother's illness; she'll recover soon.

He drove so fast that I really felt my life was in danger.

Animals on earth fascinate us with their beauty, their grace and their speed.

During the recession, many small companies were eradicated.