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

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

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

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

Those companies were closed due to some seriously financial problems.

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

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

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

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

The journalist refused to disclose the sourse of his information.

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

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

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

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

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

During the recession, many small companies were eradicated.