Electric motors range in size from the tiny mechanisms that operate sewing machine the great engines in heavy locomotives.

Many scientists contributed to development of television, whether one can be said to have invented it.

Mutualism is a relationship between animal species which both benefit.

As (you come each town, however small, you will see a sign which states the name the town and how many inhabitants does it have.

Conservation organizations help for  to preserve the ecology of area by keeping track of dangered species.

To receive (a degree from an American university, one must take many courses beside thos one’s major fiel

A professor of economy and history at our university developed new theory of the relationship between historic events and financial crises

Pop Art was a movement (of the 1950’s and 1960’s whom imagery was based readily recognized American products and people .

Everyday in summer, but especially at weekends, all kinds of vehicles bring crowds of people enjoy the various attraction.

A film isn’t worth to watch, whatever its subject, unless it engages viewer’s mind and makes him think.

Janet is finally used to cook on an electric stove after having a gas one for long.time

According to many educators , television should not become a replacement good teachers, and neither are computers

The police officer lectured the children for ten minutes about the dangers to throw stones, then let them off with a warning.

If dinosaurs would have continued roaming earth, man would have evolved quite differently

Before his death, John Dewey saw his philosophy have profound influences on education and thought the United States and elsewhere

The strength, size, and surefootedness of Hama make its as excellentcy beast of burden in mountainous regions today as it was in past

In the United States, about 75 percent of the total tomatoes crop is processed o juice, caned tomatoes, sauces, pastes, and ketchup

He has hardly never given more impressive performance than this

California has more land under irrigation than any another state

A traveler can reach some of the village along Amazon only by riverboat

Since the Great Depression of the 1930’s, social programs such as Social Security have been built into the economy to help severity business declines.