The seed heads of teasel plants raise the nap on coarse tweed cloth __________ than do the machine tools invented to replace them.

Quasars _________ emitting extremely intense radio waves and visible radiation.

The seating of musicians in an orchestra is arranged _________ to produce the desired blend of sounds from the various musical sections.

Most substances contract when they freeze so that the density of a substance's solid is ______ of its liquid

___________ commonly chosen as the first step to a career in public office

Jellyfish are probably _________ on Earth.

_________ when a person doesn't eat enough fruit and vegetables.

_______ were stones piled at intervals.

Anxiety about uncontrollable situations is thought to cause __________

They decided to finish and finally ________ the hard evening with a pizza and a few sodas

A good team _______ of both recruiting and coaching as well as performing.

The student managed to pass the entrance examination __________ he was blind.

Benjamin West contributed a great deal to American art: __________

He gave _________

The windmill, which has been used for hundreds of years to pump water and grind grains, ___________ redesigned to produce electricity.

Gilbert Stuart is considered by most art critics _________ greatest portrait painter in the North American colonies

Iron _________ for weapons and tools in the Bronze Age following the Stone Age.

Only __________ of the breeds of cattle have been brought to the United States.

Some procedures used for laboratory analysis of archaeological specimens are _______ procedures conducted in crime laboratories

_________ as the most important crop in Hawaii is sugar cane

A vacuum will neither conduct heat nor ____________

By praying outside saloons, throwing rocks in saloon windows, and destroying saloons with her hatchet __________

George belongs to the _________

_________ a bridge builder, Gustav Eiffel designed the Eiffel Tower for the Paris Exposition of 1889.

Deserts are often formed _________ they are cut off from rain __________ bearing winds by surrounding mountain ranges.

On the slope of Long's Peak in Colorado _________ the ruin of a gigantic tree.

It is earth's gravity that _______ people their weight.

Public television stations are different from commercial stations _____________

________ the jaguar used to roam freely in the southwestern United States.

Penguins, the most highly specialized of all aquatic birds, may live _____ twenty years