Target Words
constraint
contamination
deplete
dispose of
elementally
emission
extinction
reservoir
shrink
stable
Definitions and Samples
1. constraint n. Something that restricts thought or action
The constraints of military life kept Eileen from seeing Private Morris more than once a month.
2. contamination n. Being made less clean by a germ or hazardous substance
The contamination in the river came from the factory located just upstream.
3. deplete v. To greatly decrease the supply of a resource or material
The prolonged war depleted the country’s national treasury.
4. dispose of v. To throw away; to get rid of; to kill
She disposed of her unwanted possessions before moving.
The tyrant cruelly disposed of all his enemies.
5. elementally adv. In terms of elements; basically
Elementally, coal and diamonds are the same.
6. emission n. Sending out from a small space into the general environment; a substance discharged into the air
The Environmental Protection Agency regulates the emission of pollutants into the air.
7. extinction n. Complete disappearance; the end of existence
Human beings have caused the extinction of many other species.
8. reservoir n. A place where a liquid is collected and stored
Cult members threatened to poison the town’s water reservoir.
9. shrink v. To become reduced in size, amount, or value
If you dry your clothing on the “high heat” setting, they may shrink.
10. stable adj. Firm and dependable; showing little change
He fell because the ladder wasn’t stable.
TOEFL Prep I
Find the word that is closest in meaning to the opposite of each word in the left-hand column.
Write the letter in the blank.
1. stable (a) keep
2. contamination (b) expand
3. extinct (c) unsteady
4. dispose of (d) existing
5. shrink (e) purity
TOEFL Prep II
Choose the word that best completes each sentence.
1. The (constraints/contamination) of being in prison made her hate society even more.
2. A recognition that the Earth is round was one of the (elemental/shrunken) advances in thought during the time period.
3. Mother Teresa, who helped the poorest of the poor, had a great (disposal/reservoir) of love within her spirit.
4. Automobiles are responsible for some (emissions/extinction) of greenhouse gases.
5. By the end of the storm, the hikers had (depleted/reserved) even their emergency stores.
TOEFL Success
Read the passage to review the vocabulary you have learned. Answer the question that follows.
Human consumption of fossil fuels is expected to fully deplete the Earth’s crude oil reserves by the year 2060. As underground reservoirs of oil continue to shrink, we have no choice but to find alternatives.
One promising source, with much cleaner emissions, is called bio-diesel. Bio-diesel is often made from soybean oil, although it can be made from any vegetable oil that is not elementally different from soy. Bio-diesel can even be made from used cooking oils that homes or restaurants would otherwise dispose of. Bio-diesel can be used without constraint in any vehicle that runs on diesel—no modifications are needed.
Presently, diesel engines can take up to 20 percent soy in their soy-diesel blend. As the need for bio-diesel increases and the technology improves, we may soon witness the extinction of the fossil-fueled vehicle. This is good news for the planet, as bio-diesel is a more stable source of energy than petroleum, and it reduces contamination of our air and water.
An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the three answer choices that express the most important ideas in the passage. In each blank, write the letter of one of your choices.
Bio-diesel is a promising alternative to fossil fuels.
_________________
_________________
_________________
a. Humans have shown little self-restraint in their consumption of fossil fuels.
b. Underground reservoirs of oil will soon be depleted.
c. Bio-diesel burns cleaner than fossil fuels.
d. Bio-diesel comes from a more stable source than petroleum.
e. Restaurants can save disposal fees on used cooking oil.
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