The geology professor showed us sample about volcano rock which dated back  seven hundred years.

When he took the ticket out of from his pocket, a hundred dollar bill fell to the floor without notice

Both Ann and her sister look like her mother.

Lawrence Robert Klein received the 1980 Nobel Prize economics for pioneering the useful of computers to forecast economic activities

The right to vote granted to women after only the adoption of the 19th Amendment 1920.

The biologist found some pollutants, a little of which be considered very harmful to fish and other living ganisms in the river.

Tea did not become popular in Europe until the mid 17th century when it has been imported to England and Holland.

The columnist feels sure that who  wins the election will have the support of both party

Most sand dunes are always in motion as wind pushes sand upward one side of each dune, over top, and down the other side.

Some heating devices convert chemist energy like that found in wood and coal into heat energy

Most modern barns are both insulated, ventila and equipped with electricity 

Often a headache is caused by the contraction of one of muscle group that cover the skull, thus causing spasm pain

In spite of  her physician handicaps, Hele Keller graduated from Radcliffe with honors.

In the early twentieth century, there was considerable interestin sociologist in the fact that in the United States the family was losing its traditional roles

Haywood Broun was a read widely newspaper olumnist who wrote during the 1920’s and 1930’s.

An escalator is a moving stairway that transporting people from one point to another means of linked threads.

Although there are new drugs the market, deaths from malaria are being increasing in some parts the world

These engines used being started hand. But now they are started by electricity.

When radio programs became popular, approximately around 1925, people stopped attending movies.

Internet , definy causes some problem in society, however, it surely provide many benefits as well .

All the students are looking forward spending theirfree time relaxing in sun this summer