Dinosaurs became extinct millions of years ago because of the earth's climate changed drastically.

Excavations in some villages on the east bank(A) of the Euphrates River have revealed(B) an ancient community that had been laying (C) under later (D) reconstructions of the city of Babylon.

Conservation is the safeguarding and preservation of nature resources.

Neither William or his brother stole the rambutans from our orchard.

The University of Kentucky has held this prestigious title until 1989, when it was granted to the University of Georgia.

Each of the beautiful cars in the shop was quickly sold to their owner.

Folklore consists of the beliefs, customs, traditions, and telling stories that people pass from generation to generation.

Generally, Europe and Asia are regarded as being distinct continents, but they are simply vast geography divisions of the larger lad mass known as Eurasia.

Bill is often late for class, which makes his teachers angrily.

Teddy Roosevelt demonstrated his competitive spirit and tireless energy in 1905 whenever he led the Rough Riders up San Juan Hill.

An ambitious person is committed to improve his or her status at work.

In today's competitive markets, even small businesses had better to advertise on TV and radio in order to gain a share of the market.

If you need to keep fit, then why not take on a sport such as badminton or tennis?

If you work hard, you would be successful in anything you do.

I can’t go out tonight because I have too many work to do.

He was very surprised when he visited London, in that the drivers always drive on the left hand side of the street.

The freshman failed to follow the advice of her senior that he studied hard and not go out too much.

It is difficult to write rules that tell exactly when we should apologize, and it is not difficult to learn how to do it.

Manufacturers may use food additives for preserving, to color, or to flavor, or to fortify foods.

Species like snakes, lizards, coyotes, squirrels, and jack rabbits seems to exist quite happily in the desert.

Mrs. Stevens, along with her cousins from New Mexico, are planning to attend the festivities.