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

The Red River, so named because of the red-colored sediment carries, it is on of the main branches of the Mississippi.

In 1984, the world population rose to over 4.7 billion, up almost 85 million from an estimate made the year ago.

Do it right now, ______?

Country music songs are deeply personal and deal with themes of love, lonely, and separation

Neil seemed to have a good time at the party, ____?

He seldom goes to the library, ______?

Recently in the automobile industry, multinational companies have developed to the point where such few cars can be describe having been made entirely in one country.

Jobs which are highly paid some countries are badly paid in other

The sun contains 99.9 percentage the mass of solar system.

Many factories break the anti-pollution laws and _____. 

There is nothing annoying than you are interrupted when you are speaking.

I’m afraid Petra is on phone. Do you want to come in and waiting.

Mr. Smith is going to buy a new car, doesn’t he?

Bacteria are responsible of many of the textures and flavors in food and are particular important in milk products.

The number of student attending English courses at university are increasing.

When Cliff was sick with the flu, his mother made him to eat chicken and rest in bed

Southern California, is known for its mild winters, has become the new home for senior citizens escaping hard Northern winters.

Pop Art was a movement 1950’s and 1960’s whom imagery was based onreadily recognized American products and people.

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

Neither of the two candidates who had applied for admission to the Industrial Engineering Department were eligible for admission