Since the average age of families has fallen, therefore more and more women have been able to join the labor force

S. Eliot received wide recognition after publishes The Waste Land, which fused poetic traditions with elements of modern music and language.

Before she moved here, Arlene had been president of the organization since four years.

The bold way in which Margaret Mead defined the terms “family” – based as much on choice as on biological relationship – is possibly the most enduring of her legacies

Marta being chosen as the most outstanding student of her campus made her parents very happy.

Among the problems facing the national park's manager, the most serious ones are those of ...... and expansion.

There is a rumour that the army is about taking power, though this has been denied by government sources.

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

Everyone who has traveled across the United States by car, train, or bus are surprised to see such a large expanse of territory with such variation among the lifestyles of the people.

..................United States is ...................world's biggest consumer of energy. 

Lassen National Park, the situation of a dormant volcano, is one of the most beautiful but least visited parks in the western United States.

Unlike wood, paper, and fabric which tendency to disintegrate after being buried for many years, ceramics and glassware although easily broken, survive well in the ground.

He has made a lot of mistakes in his writing because his carelessness.

Kiwi birds search the ground with the bills for insects, worms, and snails to eat.

Salmon lay their eggs and die in fresh water, although they live in salt water when most of their adult lives.

This ticket doesn't cost a lot, _    ?

Algebra is the branch of mathematics concerned with operations on sets of numbers or other elements that are often represented at symbols

Drug abuse have become one of America’s the most serious social problems .

Mercury is not often visible because it is so near the sun to be seen.

Jessamyn West’s first and most famous novel, the friendly persuasion, describes the life of the Quaker farmed family in the mid-1800’s.

Numerous types of cells, such as skin cells and white blood cells, have the power reproduce asexually.