When scientists discovered how soap works, it became possible to do synthetic deterg out of Petroleum

Choose the correct answer to each of the following questions. "In addition to _____ the caves and grottos, and seeing its flora and fauna, visitors can also enjoy mountain climbing."

The more important theorem of all in plane geometry is the Pythagor Theorem.

Chicago’s Sears Tower, the taller building in the world, rises 1,522 feet from the ground to the top of its antenna.

The 6-year-old resembles to his mother somewhat more than his older brother does 

A police spokesperson confessed that detectives were baffled Mr. Day’s disappearance, but were hoping to come up with an explanation

Allen’s not having finished his thesis did not discourage him from applying for other program.

To receive a degree from an American university, one must take many cour beside those in one’s major field

Chocolate is prepared by a complexity process of cleaning, blending and roasting cocoa beans, which must ground and mixed with sugar.

Although sual living on or under rocks or on coral reefs, marine snails have been observed in a great variety of habitats

Because it is a healthy way to exercise, aerobic dancing is considered as an excelle method for release tension

Gunpowder, in some ways the most effective of all the explosive materials, were a mixture of potas nitrate, charcoal, and sulfur.

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

The National Basketball Association will not let any athlete to continue playing in league unless he submits voluntar to treatment for drug addict

Despite of rain or snow, there are always more than fifty thousand fans at the OS football games.

Lassen National Park, the situation of a dor volcano, is one of the most beautiful but least visited parks in the western United States

Sue bought (a CD play last week and she’s been listening to music ever since then.

The diameter of the Sun is more than one hundred times greater than Earth.

Roommate is not very clever student, but he certainly works very hard indeed

The teacher taught her students to look careful to the left and the right at least three times before crossing the high

Many scientists contributed to the development of television, whether no one can be to have invented it.