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TOEFL Structure: Quick Test #141-150

All questions were written by Erin Billy, specifically for the areas of difficulty of TestMagic students.

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This TOEFL structure test has ten questions. You will see an estimate of your score when you finish the test.

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Each question of this type has one grammar mistake. Choose the underlined portion that has the mistake.


I are tired, but I will study anyway.

(A) are
(B) but
(C) will
(D) anyway

In this case, we should choose (A) since I are tired is incorrect; the sentence should read I am tired, but I will study anyway.


For this type of question, choose the answer choice that best completes the sentence.


I ______ tired, but I will study anyway.

(A) is
(B) being
(C) am
(D) to be

In this case, we should choose (C) since the sentence should read I am tired, but I will study anyway.



Start Test

Time: 7 minutes

Engraving is a process [which] the surface of metal is [first covered] with [an acid] and then inscribed with some sharp [instrument].

first covered
an acid


142.For many [years ago], [much of] what was possible to know was derived [from] inspiration or divination and did not involve the rational process of reasoning in [wide use] today.

years ago
much of
wide use


143.Ayn Rand, ______ novels deal with the nature of capitalism in a democracy, is often taught in introductory courses in economics.

of many whose
whose many of
whose of many
many of whose


144.The formation of a rainbow [occurs] a process in which light is diffused at [varying] rates by the surrounding atmosphere, [resulting in] the reflection of different [wavelengths] of light.

resulting in


145.[Though] difficult, it [possible] for an adult learner of a new language [to master] the subtleties of the grammar and syntax of [the new] language.

to master
the new


146.When a bird molts, ______ loses its feathers, it is actually preparing itself for the regeneration of the lost feathers.

so its
as if
as when it
so that


147.The scientific method is a system [which] a problem or challenge [is] identified and possible solutions are created and tested, [with] the final results evaluated to determine the best approach to the [resulting] theory.



148.The Smithsonian Institution in Washington D.C. is [home to] the largest [collecting] of Native American artifacts in the United States, most [of which] remain [uncatalogued] and hidden from public view.

home to
of which


149.Many modern critics of American literature have called Mark Twain, born Samuel Clemens, ______ .

as America's greatest writer
was America's greatest writer
America's greatest writer
to have been America's greatest writer


150.In the modern [era], face-to-face communication is becoming [near] [as uncommon as] [hand-written] letters.

as uncommon as



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