Select the word or phrase that makes the following sentence grammatically correct: 'Why did we ____ try so hard?'

Correct Answer: D

Rationale: 'Have to' is the correct choice as it fits the sentence structure. The sentence is in the past tense ('did we') and requires the infinitive form 'have to' to express the idea of necessity or obligation in the past. 'Has to' (Choice A) is incorrect as it is present tense, 'haven't' (Choice B) is a negative form and does not make sense in this context, and 'had to' (Choice C) would imply a past obligation that has already been fulfilled, which is not the intended meaning here.

Correct Answer: B

Rationale: The correct phrase to complete the sentence is 'toward peace was.' In this context, 'toward peace' is the appropriate prepositional phrase to indicate the direction or goal of the work being done. Additionally, the verb tense should be in the past tense ('was') to match the structure of the sentence. Choice A and C are incorrect because 'to peace' does not convey the intended sense of direction or goal. Choice D is incorrect as 'am' is present tense, which does not agree with the past tense structure of the sentence.

Correct Answer: A

Rationale: The correct answer is 'dog, who had.' The phrase 'dog, who had' correctly indicates that Janet called her dog to run after a squirrel. In this case, 'who had' provides additional information about the dog, making the sentence grammatically accurate. Choices B, C, and D are incorrect because they do not use the appropriate relative pronoun 'who' for referring to animals.

Correct Answer: B

Rationale: The correct word to fill in the blank is 'break.' In this context, 'break' refers to a pause or rest, which is what Dr. Capra needed after completing the intense surgery. 'Brake' (choice A) refers to a device used to slow or stop a vehicle. 'Brink' (choice C) means the edge or verge of something. 'Broke' (choice D) is the past tense of 'break' and is grammatically incorrect in this sentence.

Correct Answer: D

Rationale: The correct answer is 'Our.' In this sentence, the possessive pronoun 'Our' is needed to show ownership and make the sentence grammatically correct. 'Screaming our took the shopkeeper by surprise' indicates that the shopkeeper was surprised by the screaming of a group or individuals related to 'our.' Choices A, B, and C are incorrect as they are pronouns referring to people ('We', 'They', 'Them'), not possessive pronouns that indicate ownership.