In a famous experiment conducted at University of Chicago in 1983, rats kept from sleeping died after two and a half weeks.

The news of the flood in Central provinces were broadcast over radio and television as well as published in the newspaper.

The president, with his wife and daughter, are returning from a brief vacation at Sun Valley in order to attend a press conference this afternoon.

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions

       New sources of energy have been looking for as the number of fossil fuels continues  to decrease.

In a restaurant, if we want to call the waiter, we can raise our hand and wave it slight to signal that we need assistance.

He was quite amusing when he heard what happened.

I am now in my attempt winning a place at the same university to my brother.

There are such many planets in the universe that we cannot count them.

Her weigh has increased remarkably since she began receiving treatment.

We always have believed that honesty is the best policy in personal as well as professional matters.

I saw the blind man crossed the busy road without any help.

Geothermal energy is energy to obtain by using heat from the Earth’s interior.

The nitrogen makes up over 78 percent of the Earth’s atmosphere, the gaseous mass surrounding the planet.

Owing to their superior skill, highly competitive athletes have been known to win contests and break records even when suffered from injuries, physical disorders, and infections.

A lot of athletic and non-athletic extracurricular activities are available in Vietnamese high-schools, either public and private.