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

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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. D	Sufficient 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. D	While 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. C	The [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. A	Along [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. A	In 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. A	An 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. B	Only 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. D	The 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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