The assumption that smoking has bad effects on our health have been proved.

A novel is a story long enough to fill a complete book, in that the characters and events are usually imaginary.

The leader demanded from his members a serious attitude towards work, good team spirit, and that they work hard.

Developing new technologies are time-consuming and expensive.

It is important that cancer is diagnosed and treated as early as possible in order to assure a successful cure. 

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

I enjoyed talking to the people with that I met at the party last night. 

The grass needs cutting, so let us have one of the men to take lawn-mower and do it.

What we know about certain diseases are still not sufficient to prevent them from spreading easily among the population.

United States is aimed at develop friendly relations among nations based on respect for the principle of equal rights and self-determination of people.

If one type of manufacturing expands, it is like that another type will shrink considerably.

The earth is the only planet with a large number of oxygen in its atmosphere. 

The longer the children waited in the long queue, the more impatiently they became. 

Regarding as one of the leading figures in the development of the short story, O Henry is the author of many well- known American novels.

Each of the beautiful cars in the shop was quickly sold to their owner.

Most bothersome flies belong to the family Sarcophagidae and are popular known as flesh flies because the larvae feed on flesh.