River transportation in the United States consist primarily barges pull by towboats.

Stars derive the energy from thermonuclear reactions that take place their heat interiors.

Jim didn’t have a house and a car, for he was jobless for long time

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

Everyone who (has traveled across the United States by car, train, or bus are surprised to see such a large expanse territory with such variation among the lifestyles of the people.

If you “make a “five-days” trip across the Atlantic Ocean, your ship “enters”  different time “zone” everyday

In his famous domes, architecture Buckminster Fuller utilized thousands of simple equilaterally triangles linked together.

A pair of jeans _______ in the washing machine this morning. 

New laws should be writing to accommodate changes in the society.

Diseaseis not widespread than before because of better preventive medicine and vastly improved nutrition.

.................... was the day before yesterday.

Although the social sciences different great deal from one another they share common interest of human relationships

Some psychologist believe that those who are encouraged to be independent, responsible, competent in childhood are likely more than others become motivated to achieve.

So far most million different species of insect have been identified and named

Electric lamps came into widespread use during the early 1900’s and have replaced other type of fat gas, or oil lamps for almost every purpose.

Usually the climate mountainous areas becomes much windy at higher altitude

There is a hostel the bottom of the canyon where we can stay there.

Because studies have shown that obesity can cause type of diabetes, doctors usually put his diabetic patients on special diet.

Because there was evidence against himself, Slade was released 

Some of the milk I bought last night ........... not fresh anymore.
 

 I threw my old trainers and bought some new .................. .