Since the early 1950’s,         throughout the world has more than doubled.

Even though he did not attend school until he was twelve,

Dr. Samuel C.C. Ting was ______________ the Nobel Prize in Physics in 1976.

Gas particles move__________when the gas is hot than when it is cold.

The different colors of_________ the different temperatures of the stars' surface.

As a country develops from an agricultural to an industrial

economy, the attitudes, values, structures, and functions of the family_________ .

Only a few sounds produced by insects are heard by humans _________ most of the sounds are pitched either too low or too high.

The ordinary chair________ in countless shapes, sizes, styles, and materials.

For 125 years after____________initial use at Harvard in 1642, the Bachelor of Arts degree was the only degree awarded by colleges in the United States.

Since the Sun illuminates half the surface of the Moon, only half the surface _______ can be seen from the Earth.

The novels of Constance Fenimore Woolson,__________, have special interest for their regional  settings.

__________Oklahoma is important as a farming state, it is even more important for its rich oil deposits.

No animal seems________on a diet of peat moss.

The upper part in a harmonic arrangement ______by mixed voices is usually written for a soprano voice.

The first school________the state of Washington was opened at old Fort Vancouver in 1832.

Radio,______, developed from the theories and experiments of many people.

While attempting to fly hers plane around the world in 1937, Amelia Earhart  mysteriously disappeared.

Richard Wright’s Uncle Tom’s Children, a collection of short stories, were critical success when it appeared in 1938.

The principle on which the boat called a hydrofoil is designed is identically to that demonstrated by an airplane wing moving through air.

Migrating butterflies can travel long distant   over water.

During a early period in the settlement of the western United States, pioneers claimed parts of the wilderness by marking trees to establish a boundary.

All digital computers use binary, or two-valued, digits instead than decimal, or  ten-valued, digits to represent and store data.

An ambassador serves as a nation’s highest-ranking diplomacy in another country

Early adolescence is a developmental phase consisting of rapid changes in behavior, psychological, and hormones.

Knowledge from the frontiers of research genetic will increasingly pose difficult  problems for policy makers and for society in general.

Pictures called glass mosaics are made by setting small pieces of colors glass into fresh plaster.

Approximately every nineteen month Venus and the Sun reach their greatest angular separation in the solar system.

Anthropologists recently have found evidence that, centuries ago, Inuits used to entering their subterranean homes through tunnels, which helped keep the cold out and the heat in.

The tree porcupine is found in wooded areas throughout most from  North America.

Todate, only a small percentage of all glass manufactured in the United States is recycled, but markets for recycled glass that are growing steadily

The oceans are the major source of the atmospheric moisture that is obtained through evaporator.

Only those insects with high developed, multilensed eyes have good color vision

The Earth’s atmosphere functions much like a giant greenhouse, admitting sunlight between outer space but preventing heat from escaping

The almond tree which produces the oldest species of nut and is the most widely grown of all nut trees

Fran Tannenbaum, a paleontology student doing summer fieldwork, found a completely seventy-five-million-year-old fossil egg near Chateau, Montana

Fencing, originally developed as a sport in fourteenth century, was included in the first modern Olympic Games of 1896.

Depth within ancient tombs, 3,000-year-old peanuts have been found alongside mummies

Art Nouveau developed in the 1890’s when artists did a conscious effort to break with what they regarded as worn-out formulas of the past.

The most widely cultivated all of fruit trees, the apple is second only to the grape in its importance as a temperate-zone fruit.

Pawnbroking, or making loans to customers who pledge personal or household goods as security, is one of the oldest trade known.

Of 1901 to 1914, acclaimed actor Douglas Fairbanks appeared on stage in a series of light comedies.