Sentence completion test scored by what the gap tests

Twenty sentences, one gap each, four options — and the result is five rates rather than one mark, because missing a verb sequence means nothing like missing a collocation. No clock, and every item comes back afterwards with the reason its key is the key. If you came for the projective test where you finish the sentence in your own words, that is a different instrument, explained below rather than imitated.

Two unrelated tests share this name — check which one you came for

This one is the language-testing kind: a sentence with a gap, four options, a right answer. The other is a projective instrument used in clinical psychology, where you finish an open stem in your own words and a trained rater reads what you wrote. That second kind has no options and no key, and it is not on this site.

20 sentences, four options each, no clock. Every gap is doing one of 5 jobs, and the result reports the 5 separately rather than adding them up: which class you miss says far more than how many you missed, because a tense error and a collocation error need entirely different work.

The 5 jobs a blank can be doing

Verb form and sequence — Which tense the rest of the sentence has already fixed, usually through a time expression or a second clause.
Which verb the noun takes — The one verb that fixes to this noun, where two or three others mean the same thing and are not used with it.
The preposition a word demands — The particle a specific verb, noun or adjective governs — depend on, accused of, answerable to.
The connector's own syntax — Which linking word can stand in this slot, given what follows it — a clause, a noun phrase, or nothing at all.
Register the frame has already set — Which of four synonymous options belongs in the variety of English the surrounding sentence is written in.

4 items in each class, 20 in total, every one asked exactly once. Four items is a thin denominator and the result says so — the point of the split is to tell you which class to look at, not to grade you within it.

The 20 items are interleaved so that no two of a kind arrive together — with four collocation items in a row you would work out what the class is testing from the item before, and the class rate would stop meaning anything. Nothing tells you whether an answer was right until the end, and every item comes back afterwards with the reasoning.

Five jobs a gap can be doing

Verb form and sequence: Rule-governed. Something elsewhere in the sentence — a since, a before anyone noticed — has already fixed the answer, and a miss means that signal was not read.
Collocation: Arbitrary. Nothing explains why English makes a promise and does a favor, so a miss is a pairing not yet in memory, and no rule will put it there.
Dependent preposition: Arbitrary, but in a space small enough to learn. Misses cluster on words that take two: answerable to a body, answerable for a decision.
Connector syntax: Looks like vocabulary and is syntax. However, although and despite all mark a contrast; one needs a clause, one a noun phrase, one punctuation before it.
Register: All four options are correct English, and the sentence has already committed to a setting — a letter to a regulator, a message to the next desk — that rules three of them out.

Four items per class, interleaved one class at a time in an order reshuffled each round, so no gap can be answered from the pattern of the one before. That is also why no level appears in the result: the five classes do not sit on one scale, and somebody reliable on tense and shaky on collocation — the ordinary profile of a fluent non-native writer — disappears into any average. Four items is enough to say which row to look at and not much more; one right out of four is exactly what guessing produces.

For a level rather than a diagnosis, the English level test walks a ladder of CEFR blocks and stops at the first one that breaks; the two are worth taking in that order. If the trouble is getting through long text rather than choosing the word, the reading level test is the one to try.

The other test with this name

In clinical and developmental psychology, a sentence completion test is a projective technique: open stems you finish however you like, read afterwards by a trained rater against a manual. The best known are Rotter & Rafferty (1950), Manual: The Rotter Incomplete Sentences Blank, College Form, Psychological Corporation and Loevinger (1998), Technical Foundations for Measuring Ego Development, Lawrence Erlbaum. They have no options and no key — the completions are the data and the rater is the instrument — and they are copyrighted, with validity that depends partly on the stems not circulating. Nothing of either is reproduced here and no scored version of them exists. The query covers two unrelated things. As a verbal-aptitude item type it is a question format with no norm, for the same reason the other reasoning formats have none. As a psychological instrument it means a projective sentence-completion blank, which is proprietary, is interpreted by a clinician rather than scored, and sits inside the clinical zone this site stays out of.

This is a measurement exercise, not a clinical assessment. It reports what you did on this page against a stated reference and nothing more — it cannot establish an emotional difficulty, a personality trait or anything at all about your inner life. Only a qualified professional, working with more than a browser, can make that judgment.

That matters more here than on most pages, because of the name. You choose among four words somebody else wrote, and which one fits a sentence about a kettle carries no information about you.

Arguing with the key

Two of the options are things I have definitely seen written. Why is one wrong?

Because several items are built on options that are correct English somewhere else. Come short was ordinary usage once and now reads as a translation; kindly inform me is fine in a formal letter and wrong in a message to a colleague; although marks the same contrast as however and cannot follow a semicolon. The wrong option is wrong on fit rather than grammar, and fit is what a cloze measures that a grammar quiz does not. The review says which distractor fails for which reason.

Is this the same as the sentence completion section of an aptitude test?

The format is the same and the purpose is not. A hiring or graduate aptitude test uses cloze items to rank candidates, so its items are calibrated for spread and its norms are the point; these are chosen for what they diagnose, with no norm behind them. They are still fair practice for the format, but the number at the end is not a predicted score.