Correct Answer: C

Rationale: Combining the sentences is most effective when using 'but' to contrast the two ideas. Option C is concise, clear, and provides the best flow, accurately capturing both the contrast 'but I lost them' and the sequence of events 'After spending hours looking for them, I found them in the freezer.' Options A, B, and D do not effectively combine the sentences or maintain the sequence of events and contrast between keeping track of the keys and losing them.

Correct Answer: A

Rationale: The correct answer is A. In this sentence, the phrase 'who lives next door' is a non-essential element providing additional information about the teacher. It is correctly set off by commas. Choice B does not use any commas to set off the non-essential element, making the information essential to the sentence. Choice C uses an unnecessary comma before 'who,' which disrupts the flow of the sentence. Choice D incorrectly places the non-essential element at the end of the sentence without appropriate commas, making it less clear and concise.

Correct Answer: C

Rationale: The correct answer is C. Taking good notes is not a hands-on activity; it is a cognitive skill that does not involve physical interaction or manipulation. Choices A, B, and D all involve physical activities that directly engage a child's hands and body, supporting the thesis about the importance of hands-on learning in early education. Building structures with blocks, using modeling clay, and playing hopscotch all require physical manipulation and engagement, which are key aspects of hands-on learning.

Correct Answer: D

Rationale: Choice D is the most appropriate sentence in terms of style, clarity, and punctuation. It maintains parallel structure in the sentence by using 'Although Lucinda was concerned about the possible side effects, she continued to take the medication that her doctor had prescribed for her.' This choice effectively conveys the cause and effect relationship between Lucinda's concern about side effects and her decision to continue taking the medication. Choices A, B, and C have issues with subject-verb agreement, awkward phrasing, or lack of clarity in expressing the relationship between Lucinda's concern and her action, making them less correct compared to Choice D.

Correct Answer: A

Rationale: The correct transition to add at the beginning of sentence 2 is 'Surprisingly.' This transition sets the tone for something unexpected or contrary to what was anticipated, emphasizing Mr. Shanbourne's reaction as not typical or predicted. Option B, 'Actually,' would not fit well as it does not imply any sense of surprise or contrast. Option C, 'Furthermore,' is used to add information rather than to indicate a surprising turn of events. Option D, 'Instead,' suggests a replacement or choice between alternatives, which is not suitable in this context.