A dark nebula consists of a cloud of interstellar dust enough dense to obscure the stars beyond

Astronomers do not know how many galaxies there are, but it is thought that there is millions or billions.

In that age of computers, it is difficult to imagine how tedious work of accountants and clerks must have been in the past.

Nobel Prizes are awarded to people who excellent in fields above and beyond what is expected from scholars.

Alike other forms of energy, natural gas may be used to heat homes, cook food, and even run automobiles

The athlete , together with his coach and relatives, are ravelling to Olympic Games.

Marie, ................ I met at the party, called me last night.

The Yale Daily News is oldest than any other college newspaper still  operation in the United States.

Under the crust of the Earth are bubbling hot liquids that sometime rise to the surface

Choose the best answer to complete the following sentences: Gagarin was the first person to eat and drink in zero gravity.

Encouraged by her father, _    

Earwax lubricatorsand protects the ear from foreig matter such water and insects.

In the early twentieth century, there was considerable interesting among sociologists in the fact that in the United States family was losing its traditional roles

One responsibility of human beings is not to interfere the actions of another people except in the face of injustice

What are common known as “lead” pencils are not lead, but  a mixture of graphite, clay and wax.

The steam engine is usually thought of as a relative modern invention, but the Greeks built kind of steam engine ancient times

California has more land under irrigation than other state

From 1905 to 1920, American novelist Edith Wharton was at the height of writing career, publishing of her three most famous novels.

Once scientist had figured out the precise path of the comet, he is finding that he was able to predict its next appearance

Many poets enhance their work by creating contrast among realism and symbolism in a given poem

Those who have never been abroad is eager to see how different other cultures are