Correct Answer: D

Rationale: The correct answer is 'D: Rare.' In the sentence, it is mentioned that 'a hundred years ago, automobiles were rare,' which provides the context that the opposite of rare would mean something very common, thus helping to decipher the meaning of 'ubiquitous.' Choice A, 'Ago,' refers to a time frame and doesn't directly provide a contrast to 'ubiquitous.' Choice B, 'Cars,' is mentioned in both parts of the sentence and does not help in defining 'ubiquitous.' Choice C, 'Now,' signifies the current time but doesn't contrast with 'ubiquitous' to aid in its understanding.

Correct Answer: D

Rationale: The underlined portion 'New students' is a noun phrase. In this sentence, 'New students' acts as the subject of the sentence, making it a noun phrase. A dependent clause is a group of words with a subject and a verb that cannot stand alone as a sentence. An adverbial phrase modifies a verb, an adjective, or another adverb in a sentence. An adjective clause is a group of words that describes a noun in the sentence. None of these definitions apply to the underlined portion in the sentence provided, making 'Noun phrase' the correct identification.

Correct Answer: A

Rationale: The correct answer is 'However.' In this context, the transitional word 'However' is used to introduce a contrast between the two sentences. The first sentence presents an argument about the potential dangers of complete freedom of speech, while the second questions the notion of living in a free society without such freedom. 'However' establishes a logical link by indicating a shift or contradiction in ideas. Choice B, 'Therefore,' would imply a cause-and-effect relationship, which is not supported by the content of the sentences. Choice C, 'So,' would indicate a conclusion or result, which does not fit the context. Choice D, 'Supposedly,' is not a suitable transitional word in this context as it does not connect the contrasting ideas presented in the sentences.

Correct Answer: B

Rationale: The correct answer is B. This sentence effectively follows the conventions of standard written English by clearly presenting the subject ('The two brothers, Wilbur and Orville Wright') and the verb ('tested') with appropriate punctuation. Choice A introduces an unnecessary comma and could be more concise. Choice C changes the tense of the verb to 'were testing,' which is not required for the context provided. Choice D creates a more awkward sentence structure by placing the location at the beginning and using 'came and tested,' which is less direct than 'tested'. Thus, Choice B is the most effective and grammatically correct option.

Correct Answer: D

Rationale: The correct answer is 'Charlotte's new German shepherd puppy.' A noun phrase is a group of words centered around a noun that functions as a subject, object, or complement within a sentence. In this sentence, 'Charlotte's new German shepherd puppy' is a noun phrase as it consists of multiple words ('Charlotte's,' 'new,' 'German shepherd,' 'puppy') and it serves as the subject of the sentence. Choice A, 'Puppy,' is not a complete noun phrase as it lacks the additional descriptors. Choice B, 'Charlotte,' is a proper noun and not a noun phrase. Choice C, 'German shepherd puppy,' is a noun phrase, but it does not include all the elements present in the complete noun phrase 'Charlotte's new German shepherd puppy.' Therefore, 'Charlotte's new German shepherd puppy' is the correct noun phrase in this sentence.