He warned me to make an eye on my luggage as that place was full of thieves

The brothers Grimm intended their fairy tales to be studied by scholars of German literature and not to enjoy as simple stories by children

Nobody knows the truth, _    ?

The teacher decided to fail the student with the grounds of his poor performance in tests and too small progress

Most of the magnesium used in the United States comes from the sea water.

In 1991, Antonia Novello, the Unites States Surgeon General launched several programs to address particular problem that young people have

The world’s rain forests are being cut down at the rate on 3000 acres per hour

A number of the Pacific Islands are volcanoes that have pushed up from the ocean floor, the others are the tops sunken mountain ranges

Choose the correct answer to complete the sentence. "I have advised you on _____ to cut down your energy use"

The ozone layer must be protected because it shields the Earth from excessive ultraviolet radiations

Choose the correct answer to complete the sentence. "Deforestation is one of the _____ environmental threats to the ecological balance in the world"

Many automobile factories have found that human operators work more effective than automated ones in regard to flexible decision making

If it is kept dry, a seed can still sprout up to forty years after their formation

Some snakes have hollow teeth are called fangs that they use to poison their victims

Before bridges were built, all transport across major rivers in the area were by ferryboat.

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

Exercising well is as important to your health as sleep and eating correctly

To survive , most birds must eat at least half their own weigh in food every day

All of the mammals, dolphins are undoubtedly among the friendly to human.

A computer networks usually includes either selected employees of a particular business or or people who do not work together but have similar interests.

Not everyone believes that ..................technology has improved .................. quality of people's lives.