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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_________ .

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.

The word “it” in line 2 refers to

The word “housing” in line 3 is closest in meaning to

It can be inferred from the passage that there was interest in designing a new type of pen because the old ones

The word “expire” in line 8 is closest in meaning to

It can be inferred that the ballpoint pen first gained popularity among

Which of the following statements is true of the ball in a ballpointpen?

The author mentions a “suction pump” in line 17 to indicate a function of the

The word “which” in line 19 refers to

What was the purpose of the small hole mentioned in line 20?

Until recently one limitation of ballpoint pens was