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Free TOEFL Practice :: Structure 121-130 ANSWERS

 

TOEFL Structure: Quick Test #121-130: Answers and Explanations

 

Start of Test

Time: 7 minutes

121. C
The bonds holding protons neutrons and electrons [together] [in orbit] around an [atom] nucleus [are] among the strongest known to scientists.

together
in orbit
atom

Correction: atom's.

nucleus is a singular count noun and therefore needs a determiner. 's is a determiner.

are

 

122. DSufficient gravitational force is ______ atmosphere; otherwise the atmosphere will drift off into space.

necessary for retaining planet

planet and atmosphere are singular count nouns and therefore need determiners.

retaining necessary planet

planet and atmosphere are singular count nouns and therefore need determiners.

retained by necessary planet

planet and atmosphere are singular count nouns and therefore need determiners.

necessary to retain a planet's

 planet is a singular count noun and therefore needs a determiner. a is a determiner.

123. DWhile oxygen is readily available in isolated form, ______ .

hydrogen does not

We use do to replace all verbs except be-verbs and modals.

no hydrogen

We have no main verb here.

not any hydrogen

We have no main verb here.

hydrogen is not

We need to use a be-verb to replace the first be-verb.

 

124. CThe [varying] orbit [of] Pluto means that [ambient] temperatures also [vary] greatly.

varying
of
ambient

Correction: its ambient.

We need to use a determiner with temperatures to show that the temperatures belong to Pluto and are not general temperatures. its is a determiner.

vary

 

125. AAlong [northernmost] edge [of] the United States [runs] the US/Canada [border].

northernmost

Correction: the northernmost.
edge is a singular count noun and therefore needs a determiner. the is a determiner.

of
runs
border

 

126. AIn most states a sales tax ranging from two per cent to ten per cent ______ on most purchases of luxury items.

is levied

We simply need a singular verb for the singular subject tax.

are levied
to levy
levying

 

127. AAn iron smelting forge ______ ore into usable metals.

melts

We simply need a singular verb to agree with the singular subject forge. We need to use the simple present tense for facts that are generally true.

is melting

We cannot use the progressive since we are stating a fact.
melting
should melting

 

128. BOnly after [losing] its skin does [snake] begin [to grow] [another].

losing
snake

Correction: a snake.

snake is a singular count noun and therefore needs a determiner. a is a determiner.

to grow
another

 

129. C[Lost among] the [devastation] of the tornado [was] the remains of the houses and [buildings].

Lost among
devastation
was

Correction: were.

The main subject of this sentence is remains, which is a plural noun. We therefore need to have a plural verb. This question is hard because the subject and verb are inverted.

buildings

 

130. DThe one in charge of a meeting ______ toward the end of the meeting.

table general important topics
tables generally the important topics
generally the topic of the table
generally tables important topics

The main verb of this sentence is tables, which means postpones. We need to have the adverb generally before tables since generally modifies tables. This question is hard because tables is usually a noun, so when we see it as a verb, we can become confused very easily.

 

 

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