Cambridge C2 Open Cloze: Ellipsis, Substitution, and Inversion

Some open-cloze gaps cannot be solved inside their own clause:

The new model predicts local temperatures more accurately than the old one ______.

The missing word is did. It substitutes for predicted local temperatures, and its past tense is licensed by the comparison. Repeating the lexical verb would be unnecessary; leaving the clause without an auxiliary would make it incomplete.

Cambridge C2 Proficiency Reading and Use of English Part 2 is an eight-gap open cloze focused on awareness and control of grammar, with some vocabulary. This lesson targets grammar that operates across clauses: ellipsis, auxiliary substitution, comparative reference, and negative inversion.

Continue in the Cambridge C1/C2 vocabulary practice hub or the broader Exam English collection.

Why this focus belongs at C2

At C1, a gap often has a visible local controller such as capable of or so that. C2 texts can require you to maintain agreement, tense, polarity, and reference across a longer span. The answer is still one word, but the licensing evidence may sit in the previous clause or sentence.

Use a three-part check:

1. Identify the missing grammatical function.
2. Locate the earlier material being substituted or elided.
3. rebuild the full clause mentally and match tense, agreement, and polarity.

Auxiliary substitution with do

Forms of do can replace a lexical verb phrase:

The later survey reached more households than the first survey did.

Here did means “reached households.” Choose do, does, or did from the subject and time. If the earlier verb already uses an auxiliary, English may repeat that auxiliary instead:

The coastal site has changed more rapidly than the inland site has.

Do not automatically insert do whenever a verb is omitted.

So and not as clausal substitutes

So can stand for a positive clause after verbs such as think, believe, suppose, expect, and appear in appropriate frames:

Will the policy change? Most analysts think so.

Not can substitute for a negative proposition, though its distribution depends on the verb:

Will the change be immediate? Probably not.

Is the estimate exact? We hope not.

Do not treat so as a general pronoun. It represents a proposition recoverable from context.

One and ones as nominal substitutes

One/ones replace countable noun phrases:

The revised estimate is lower than the original one. These samples are cleaner than the coastal ones.

They cannot normally replace an uncountable noun in the same way. For evidence or information, restructure rather than write an evidence one.

Comparative ellipsis

Comparison clauses frequently omit repeated material:

The outcome was less predictable than researchers had expected it to be.

More sites were affected than had initially been reported.

The retained auxiliary reveals voice and aspect. A one-word gap may be had, was, did, been, or would, depending on the fixed material.

Negative inversion after restrictive adverbials

When certain negative or restrictive expressions move to the front, the clause takes question-like auxiliary order:

Rarely has one dataset attracted so much scrutiny. Only after the records were digitised did the pattern become visible. Not until May was the error corrected. Under no circumstances should the files be removed.

The fronted phrase licenses inversion; the auxiliary must match tense, voice, and subject.

Correlative structures

Some long-range patterns require a small linking word:

• no sooner ... than;
• hardly/scarcely ... when;
• not only ... but;
• the more ... the more;
• whether ... or.

These are fixed relationships. Topic meaning alone will not supply the answer.

Original eight-gap open cloze

The text is original practice, not Cambridge sample, leaked, recalled, or predicted material. Write one word per gap.

Revisiting urban temperature records

Few historical temperature series have received as much attention as the city archive (1) ______. Researchers long assumed that the centre had warmed faster than the suburbs, and early models appeared to confirm it, as (2) ______ the first digitised reconstruction.

Only after thousands of handwritten readings were digitised (3) ______ analysts notice a change in where instruments had been placed. The older sites were more exposed to afternoon shade than the later (4) ______, making a direct comparison difficult.

No sooner had the team corrected for location (5) ______ a weaker warming pattern emerged. The centre had still warmed, but not as sharply as the team had once thought it might (6) ______. Nor (7) ______ the correction eliminate every uncertainty, because several years of records were missing.

The more carefully the team reconstructed those gaps, the (8) ______ cautious its conclusions became. The revised study therefore presented a range rather than a single definitive estimate.

Answers and rationales

1. has. The comparative frame means “as much attention as the city archive has received.” The present perfect auxiliary substitutes for the repeated verb phrase and agrees with singular archive.

2. did. In as did the first digitised reconstruction, did substitutes for appeared to confirm it. The past auxiliary also agrees with the singular subject that follows it in the comparative clause.

3. did. Fronted Only after... triggers subject–auxiliary inversion. The main event notice is in the base form, so past auxiliary did is required.

4. ones. The word replaces plural count noun sites. Later ones contrasts the later instrument sites with the older sites without repetition.

5. than. The fixed correlative is no sooner ... than. The fronted first half already contains inverted had the team corrected.

6. have. The modal-perfect sequence means “might have warmed.” Have preserves the earlier possible event after might; neither do nor be can substitute for the perfect verb phrase here.

7. did. Initial Nor continues a negative statement and triggers inversion. Eliminate is a base verb and the event is past, so did is required.

8. more. The fixed comparative correlative is the more ..., the more .... The printed adjective and finite verb complete the second half, while the next sentence confirms increasing caution rather than decreasing caution.

Reconstruct the hidden clause

For gap 6, write out the repetition:

The centre had not warmed as sharply as the team had once thought it might have warmed.

Then remove repeated content:

... as the team had once thought it might have.

This reconstruction confirms time and modality. It also prevents did, which cannot follow might and would lose the perfect relationship established in the sentence.

For gap 1:

Few series have received as much attention as the city archive has received.

The elided version retains has, not did, because the comparison is framed in the present perfect.

Focused practice

Supply one word.

1. The rural readings have changed less than the coastal readings ______.
2. Only when the map was enlarged ______ the boundary become visible.
3. These estimates are more conservative than the earlier ______.
4. No sooner had the announcement been made ______ objections appeared.
5. The first model predicted a sharper decline than the revised model ______.
6. Rarely ______ a technical correction prompted such broad public discussion.
7. The team expected the discrepancy to disappear, but it did not do ______.
8. The more complete the archive became, the less plausible the original explanation ______ to contemporary reviewers.

Answers: 1 have, substituting for have changed; 2 did, inversion with a past base verb; 3 ones, replacing plural count noun estimates; 4 than, completing the correlative; 5 did, replacing past predicted; 6 has, present-perfect inversion with singular subject; 7 so, representing disappear after do in the established pattern; 8 seemed, because to contemporary reviewers selects an appearance judgement rather than a bare change of state.

The eighth example demonstrates a design principle: the complement after the gap can make a lexical choice deterministic. Seemed to contemporary reviewers reports an appearance judgement; a bare became cannot take that complement in the same frame.

Common errors

• Repeating do when the earlier clause requires have, be, or a modal.
• Matching the nearest noun instead of the actual subject of the elided clause.
• Using one to replace an uncountable noun.
• Missing inversion after fronted only, rarely, nor, or not until.
• Writing when after no sooner instead of than.
• Treating so as a generic replacement without a recoverable proposition.
• Losing perfect aspect by substituting did for had.
• Solving locally and ignoring the clause that supplies the omitted meaning.

A C2 open-cloze routine

First, mark each finite verb and subject. Second, underline any fronted restrictive phrase or comparative trigger. Third, expand omitted content in plain language. Fourth, select the one word that carries tense, agreement, voice, or linkage. Finally, read the whole paragraph to confirm that reference is stable.

This routine is slower than guessing from proximity but faster than reconsidering multiple answers. With practice, patterns such as only after ... did, no sooner ... than, and a repeated perfect auxiliary become visible immediately.

Independent practice

Write a 130-word open cloze about researchers correcting an old survey. Create eight gaps: two auxiliary substitutions, one one/ones substitution, two inversions, one no sooner ... than structure, one propositional so/not, and one comparative ellipsis. Provide the expanded underlying clause and rationale for each answer. Reject any item for which two standard one-word completions remain possible.

Sources

• C2 Proficiency exam format — Cambridge English
• C2 Proficiency preparation — Cambridge English
• C2 Proficiency handbook for teachers — Cambridge English

Related articles

• Cambridge C2 Open Cloze: Grammar and Fixed Phrases
• Cambridge C2 Key Word Transformations: Meaning and Collocation
• Cambridge C2 Word Formation: Control Vocabulary Families
• Cambridge C2 Vocabulary: Precision Beyond C1

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