Many theories on conserving the purity of water has been proposed but not one has been as widely accepted as  one.

Today there is an unusually large amount of students in the class 

Zoos in New Orleans, San Diego, Detroit, and the Bronx become biological parks where animals roams free and people watch from across a moat.

His father plays an important part ...................educating him. 

About 150 years ago, Charles Darwin shocked the world with his the cry that humans relativity to apes.

Visitors may realize that even though can’t make their homes in Da Lat City, they can take away (with them memor of their beauty .

He scored so good a goal that wild cheer raised from the stands

The two men, disguising as security guards, overpowered staff (at the bank and escaped with £150,000.

A light year is the distance that light travels in one year calculated by using the speed 186,284 miles the second as a base.

They are going to have to leave soon, and so do  we.

A teacher at the school acknowledged that, despite government sponsored endeavors to improve classroom performance, an extraordinary high percentage of their students gain admission to higher education.

Both Mr. and Mrs. Smith are explaining the children the rules of the game

There are different and similarities between Vietnamese and American culture

From now on , we’re going study really hardly and make sure we will pass exams

The bite the Black Widow spider can be ver inflammatory to the affected ners that hospitalization may be required .

Before she moved here, Arlene had been president of organization since four years.

Jeff and Gloria went to pick out carpeting and decoration, including furnitures, for the new VIP lounge that was opening the third floor.

The mosquito has needle-shaped mouthparts that piercing skin to suck blood.

It was near end of prehistoric times the first wheeled vehicles appeared.

The function of pain is to warn the individual of danger, so he can take action avoid more serious damage

To the men who worked so hard on the project, news was profound disappointing.