Correct Answer: A

Rationale: The transitional words in the sentence are 'after' and 'then,' which indicate the sequence of events that occurred. 'After' shows the order in which events took place, while 'then' is used to connect the idea of Tracy having dinner with her family before taking a walk to the park. Choices B, C, and D do not function as transitional words in this context. 'At, with, to' are prepositions indicating location or relationship, 'had, took' are past tense verbs, and 'a, the' are articles used for nouns.

Correct Answer: C

Rationale: Choice C is the correct answer as it demonstrates proper subject-verb agreement. 'Lots of people' is a plural subject, requiring the plural verb 'were.' The verb 'auditioning' is also in the correct tense to match the subject. Choices A, B, and D contain errors in subject-verb agreement. In Choice A, 'There is two constellations' should be corrected to 'There are two constellations' to match the plural subject. In Choice B, 'four of the sheep needs' should be 'four of the sheep need' to agree with the plural subject. In Choice D, 'Everyone in the group have completed' should be 'Everyone in the group has completed' to match the singular subject 'Everyone.'

Correct Answer: A

Rationale: Choice A is the correct answer as the sentence is correctly punctuated using em dashes to set off the list. The em dashes help to clearly separate the list of tools from the rest of the sentence. In Choice B, a colon is used, which is incorrect as colons are typically used to introduce a list, not within the list itself. Choice C lacks any punctuation to separate the list, making it unclear and incorrect. Choice D uses semicolons, which are not appropriate for separating items in a list, making it incorrect as well.

Correct Answer: A

Rationale: In the sentence provided, the words that function as nouns are 'Robert,' 'sources,' 'project,' 'databases,' and 'research.' These words are all objects or concepts that can be referenced or identified in a sentence as nouns. Choice B includes adjectives ('final,' 'academic') which describe other nouns rather than being nouns themselves. Choice C includes a pronoun ('he') which is not a noun. Choice D lacks the noun 'Robert' which is a subject in the sentence.

Correct Answer: A

Rationale: Option A uses correct punctuation by correctly utilizing the semicolon to separate two closely related independent clauses. This punctuation choice effectively conveys the relationship between the two ideas presented in the sentence. Choice B is incorrect because it uses a comma without a coordinating conjunction to join two independent clauses. Choice C is incorrect as it lacks the coordinating conjunction 'and' after the comma to connect the two independent clauses. Choice D is incorrect because it lacks any punctuation or conjunction to properly separate the two independent clauses, leading to a run-on sentence.