Because they had spent too many time considering the new contract, the students lost the chance to lease the apartment.

Oxygen plays a important role in maintaining live.

People in every part of the world readily and easily communicates by means of electronic mail.

I was amazed that Smith showed so few grief at his mother’s death.

Ecologists are trying to preserve our environment for future generations by protecting the ozone layer, purifying the air, and have planted the trees that have been cut down.

The director, as well as his wife and two children, were injured in the accident.

It is very difficult for human beings fighting pollution.

The notion that students are not sufficiently involved in their education is one reason for the recently surge of support for undergraduate research.

Anyone reproducing copyrighted works without permission of the holders of the copyrights are breaking the law.

Chemical engineering is based in the principles of physics, chemistry, and mathematics.

Mai and Lan have a row because they have misunderstood one another.

Those who had already purchased tickets were instructed to go to gate first immediately.

We had better to review this lesson carefully because we will have some questions on it.

Developing new technologies are time-consuming and expensive.

How much times did Rich and Jennifer have to do the experiment?

The threat of being dismissed do not worry me any more because I have started my own business.

The teacher asked him why hadn’t he done his homework, but he said nothing.

Unlike many writings of her time, she was not preoccupied with morality.

The telephone rang several times and then stop before I could answer it.

When you are writing or speaking English it is important to use language that includes both men and women equally the same.

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