The number of women earning Master's Degrees have risen sharply in recent years.

My father asked me where had I gone the night before.

I can’t go out tonight because I have too many work to do.

Ecologists are trying to preserve our environment for future generations by protecting the ozone layer, purifying the air, and have planted the trees that have been cut down.

In spite of my father is old , he gets up early and does morning exercise.

Most bothersome flies belong to the family Sarcophagidae and are popular known as flesh flies because the larvae feed on flesh.

Not one in one hundred children exposed to the disease are likely to develop symptoms of it.

If I could speak two languages last years, I would have got a good job.

My sister told me that she had met my teacher at the supermarket yesterday.

If you work hard, you would be successful in anything you do.

Teddy Roosevelt demonstrated his competitive spirit and tireless energy in 1905 whenever he led the Rough Riders up San Juan Hill.

For thousands of years, man has created sweet-smelling substances from wood, herbs and flowers and using them for perfumes or medicine.

The developing of the submarine was hindered by the lack of a power source that could propel an underwater vessel.

Bill is often late for class, which makes his teachers angrily.

Building thousands of years ago, the ancient palace is popular with modern tourists.

The Red Cross organizes and leads relief assistance missions after natural disasters such as floods, tsunamis, earthquakes, and homelessness.

To reduce pollution, we have to stop using many things that makes our life comfortable.

Henry David Thoreau was an American writer who is remembered for his faith in religious significance of the nature.

Reading several books on that subject, Bill considered himself an expert.

It is important that you turned off the heater every morning before you leave for class.

Air pollution, together with littering, are causing many problems in our large, industrial cities today.