David is talking to his friend, _    ?

As you come to each town, however small, you will see a sign which states the name of the town and how many inhabitants does it have

Every society changes, but not change at the same rate or in the same direction .

Either humans and animals learn by experience, and what is learned influences the planning and carrying out of simple actions.

Some birds can travel at speeds approaching one hundred miles an hour, and a few land animals can so.

In pools, goldfish are not just ornamental; since they feed on mosquito larva, they are also benefit.

Bacteria lived in the soil play a vital role in recycling the Carbon and Nitrogen needed by plants.

Choose the correct answer to complete the sentence. "He was admired for _____ donated a lot of money to environmental protection campaigns"

It is estimated that at least a million meteors have hit the Earth’s land surface, which is only 25 percentage of the planet

The local economy which once used to be in crisis now depends to a great extent on menial jobs provided by the recent development of ecotourism.

When you go to........... store, please buy........... bottle of ...........chocolate milk and........... dozen oranges. 

No one is better at English than Lan, _    ?

The peasant’s wife, who have been married for four times, has just had her third baby

The wooden fence surrounded the factory is beginning to fall down because of the rain.

There was a very interesting news on the radio this morning about the earthquake in Italy.

The surface conditions on Mars are the more similar with the Earth’s than those of nay other planet in the solar system

Advertising it provides most of the income for magazine, newspapers, radio, and television in the United States today

A dancing is the oldest and liveliest of the arts.

The company suffered substantial losses after the stock market crash and found it difficult for recovering.

In human beings, as in other mammal, hairs around the eyes, in ears and in the nose prevent dust, insects, and other matters from entering these organs.

If dinosaurs would have continued roaming the earth, man would have evolved quite differently.