Sleeping all day, to eat too much and never going out is unhealthy.

The news today are always full of stories about people who are unhappy

The most of the energy used in our homes and factories is generated from coal, oil and natural gas

To those who favorite free trade, the revival of barter can suggest nothing less than a disaster.

The ancestors of some French Americans originally came to The United State because of the French Revolution, that broke out in 1789

The threat of being dismissed do not worry me any more because I have started my own business.

Indiscriminately dumping of waste material and inadequate sewage treatment are two serious causes of environmental pollution.

With cable broadband, you can go from one web page to another much quickly than you can. With a dial-up modem or DSL, and you can load web pages more readily.

She thinks they will come, _    ?

Mosquitoes will accepts the malaria parasite at only one stage of the parasite’s complex life cycle.

The library at the university is new and has taken her name from the wife of the first president of the university.

When I walked into my office, I found Tom was using my telephone

Salmon lay their eggs and die in fresh water, although they live in salt water when most of their adult lives.

Life expectancy has increased a great deal in spite of modern medicine and technology.

The orangutan’s hands and feet arc designed for holding and grasping branches, dud its powerful immensely arms enable it to climb and swing in trees without difficulty.

He usually travels to..................Philadelphia by.................. train. 

However types of raw materials are used in making paper, the process is essentially the same.

Though he did not develop sign language, Laurent Clerc brought it on America from France

Hawaii’s eight major islands and numerous islets form the only state in the United States that is not lie on the mainland of North America.

Running along the 180th meridian, the International Date Line is separated one day from another

The world oceans have risen on average of 6 inches over the past 100 years, which has been considered as an evidence that global warming has an effect.