Correct Answer: C

Rationale: The word 'draw' is used incorrectly in the sentence. The correct word that needs to be used is 'criteria' instead of 'criterion' to maintain subject-verb agreement. The correct sentence should be: 'Which criteria were used to draw a conclusion about their findings?' 'Draw' should be 'were drawn' to match the plural subject 'criteria.' The other choices are correct in the sentence and do not contain any errors.

Correct Answer: C

Rationale: The correct preposition to use in this sentence is 'for.' The sentence should read: 'We had been working for nine hours.' This preposition is used to indicate the duration of time something has been happening. Choice A ('since') is incorrect because it is used to indicate a specific point in time when an action started. Choice B ('near') is incorrect as it does not convey the intended meaning of the sentence. Choice D ('in') is incorrect as it does not appropriately indicate the duration of time the action has been taking place.

Correct Answer: C

Rationale: The correct punctuation needed in the sentence is a colon. A colon is used to introduce a list or an explanation. In this case, the colon helps to indicate that the following phrase ('Remember the old saying') is providing an explanation or clarification related to the phrase before it. Choice A, the exclamation point, is incorrect as the sentence is not expressing strong emotion or excitement. Choice B, the apostrophe, is incorrect as it is not needed for possession or contraction. Choice D, the semicolon, is incorrect as it is used to connect two independent clauses, which is not the case here.

Correct Answer: C

Rationale: The word 'draw' is used incorrectly in the sentence. The correct word that needs to be used is 'criteria' instead of 'criterion' to maintain subject-verb agreement. The correct sentence should be: 'Which criteria were used to draw a conclusion about their findings?' 'Draw' should be 'were drawn' to match the plural subject 'criteria.' The other choices are correct in the sentence and do not contain any errors.

Correct Answer: C

Rationale: The correct answer is 'will be certified' because it correctly indicates the future tense of the action of certifying the students after they pass the exam. This phrase accurately conveys the timing of the certification process in relation to the completion of the exam. Choice A 'being certified' is incorrect as it does not specify the future tense, while choice B 'have been certified' is incorrect as it indicates a past action. Choice D 'are certifying' is incorrect as it suggests the certification is currently happening, which is not the intended meaning in the sentence.