Researchers in economics, psychology, and marketing can help businesses.

Lawrence Robert Klein received the 1980 Nobel Prize in economics for pioneering the useful of computers to forecast economic activity.

The sun contains 99.9 percentage the mass of solar system.

To assure the safely of those workers who must handle radioactive materials, the employer should not leave them enter contaminated areas without protective clothing.

He never tells a lie, ________?

How much times did Rick and Jennifer have to do the experiment before they obtained  results they had been expecting?

The common form of treatment it is mass inoculation and chlorination of water sources

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

Dinosaurs became _________millions of years ago.

We chose to take a trip to the FaEast because it was advertised adventurous and intrigued

Were you brought _____ in the city or in the country? 

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

Identify the error in each sentence: Despite there are some disadvantages, the potential of alternative sources of energy is great.

A: “May I take this CD to my room, please?” B: “_________________”.

Then people learned how ........……telegraph messages

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

In its pure State, aluminum is a weak metal, but when combined elements such as copper or magnesium, it is formed alloys of great strength

Before the telephone was invented by Alexander Graham Bell in 1876, it was hard for people ........……over long distances.

To be successful in an interview, you should control the feeling of pressure and making good impression on  interview

The basic law of addition, subtraction, multiplication and division are taught to all elementary school students

It was Mary Anderson, an amateur invention, who first patented windshield wipers automobiles