TOEFL Practice Online Test
______ aluminum is exposed to oxygen, a tough, invisible oxide forms, making it extremely corrosion-resistant.
"Once" is used in an adverb clause to show time relationship. The meaning of "once" is similar to "when."
_____ different species of birds can be gained through the use of binoculars.
Amphibians thrive in humid areas, nevertheless, their habitats are constantly decreased __________ new construction.
Sprinkler irrigation systems are restricted to places ______ sufficient quantities of energy exist.
The most gignatic planet of the solar system, Jupiter is about 11 times as larger as Earth.
John B. Anderson, a congressman, became eminent for his liberal stance on debatable issues _____ an independent candidate for President of the United States in 1980.
Like the most ______ insects, common flies have two compound eyes, consisting of many six-sided lenses.
After a rainfall in the desert, the water _____ in the playas either vaporizes or trickles down into the earth.
ROM is a chip memory whose contents are permanently stored in a computer and it cannot be altered by any user.
______ the Silurian Period, there was significant radiation of rapacious fish equipped with bulky jaws.
A time preposition is needed here. Although all the choices deal with time, only "during" is the correct answer; it emphasizes a point in time.
Carl Sandburg he elicited controversy with his candid, realistic free verse.
Beryllium is used as a bonding agent for nuclear fuel elements ____ toughness and excellent resistance to heat.
"Because of "is a preposition that is followed by a noun object; it is used to show a reason.
The pancreas's ______ of insulin impairs the body's ability to use up and preserve sugar.
After the wine is clarified, it _____ in wooden kegs or stainless steel tanks to age.
The Blue Mountains in Washington are neither as tall not as rocky as the Cascades.
The Gulf of Mexico has produced _____ as well as dark-shaded pearls that have a metallic gloss.
Mary McLeod Bethune, a leading African-American _____, as a child attended the local free school.
The noun "educator" is needed to modify the adjective " a leading African-American."
Natural rubber is an exceptionally useful raw material because it retains air, keeps out moisture, and does not ______ electricity.
On the Welland Canal of the St. Lawrence, the locks are set in pairs, letting vessels move both up or down the water concurrently.
Proved to be without air and water, Mercury sequentially freezes and bakes ______ the sun.
By examining what the prehistoric people left behind, scientists are able to tell us ______.
The majority of bebop musicians employed a technical treatment ______ them to play a long, astonishing musical phrases with various notes.
Shortening the travel distance between the Atlantic and Pacific Ocean by more than 7800 miles, the Panama Canal is ______ canal in the world.
______ the features of a character, cartoonist may convey political comments and editorial opinions in various publication and motion pictures.
Sickle-cell anemia, which is a genetic defect, is caused by ____ that encourages a faulty form of hemoglobin.
This question is based on the correct word order. Only (B) has the right order.
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