Correct Answer: B

Rationale: The topic sentence in a paragraph typically introduces the main idea or topic of the paragraph. In this case, choice B correctly serves as the topic sentence by clearly stating that gingivitis is a mild form of gum disease caused by bacteria that leads to inflammation of the gums. Choices A, C, and D provide additional information that supports or follows the main idea but do not present the overarching topic of the paragraph.

Correct Answer: B

Rationale: The correct answer is B: Brainstorm interesting topics and ideas. Brainstorming is an essential initial step in the creative process of generating ideas for a group presentation. It allows team members to freely share thoughts, explore various angles, and come up with innovative concepts. Choice A, interviewing sources, typically comes after brainstorming to gather information. Choice C, developing an organized outline, usually follows brainstorming to structure the presentation content. Choice D, citing sources, is important but is not the first step in the idea generation process.

Correct Answer: C

Rationale: Option C combines the ideas in a clear and logical manner by explaining that Laura was on her way to a concert, got stuck in traffic, and thought she would miss the concert. This choice maintains the correct sequence of events, highlighting the cause-effect relationship between being stuck in traffic and potentially missing the concert. Choices A, B, and D either disrupt the logical sequence of events or introduce redundancy in the information provided, making them less effective in conveying the intended message.

Correct Answer: B

Rationale: The sentence 'Cooking requires a number of different skills that can be learned and practiced' effectively introduces the main idea of the paragraph, making it a strong topic sentence. Choice A is vague and does not clearly establish the central theme. Choice C focuses on a specific tool rather than the broader concept of cooking skills. Choice D is more about the process of learning a particular skill rather than encompassing the range of skills needed for cooking.

Correct Answer: B

Rationale: The main purpose of a thesis statement is to clearly state the main idea or argument of the essay. It serves as a roadmap for the reader, outlining the central point that the essay will address. Choice A, 'To summarize the essay,' is incorrect because while a thesis statement does provide a concise summary of the main point, its primary function is to present the main idea, not summarize the entire essay. Choice C, 'To ask a question,' is incorrect as a thesis statement is a declarative statement that asserts a position or argument rather than posing a question. Choice D, 'To provide evidence,' is incorrect because a thesis statement does not offer evidence but rather sets the direction and focus for the evidence that will be presented in the essay.