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Okay, let's break down this passage and the questions.

Question 21. The passage discusses experts' opinions, both optimistic and pessimistic, about the long-term impact of new AI tools on essential human elements. It highlights their concerns and potential solutions. Therefore, a fitting title would be:

B. Artificial Intelligence and the Future of Humans

Question 22. The passage states, "Yet, most experts, regardless of whether they are optimistic or not, expressed concerns about the long-term impact of these new tools on the essential elements of being human." While it mentions some optimism, the overarching sentiment regarding the long-term impact leans towards concern. The passage doesn't explicitly state what experts predict for the next decade regarding making people better or worse off overall. It focuses more on the potential threats to "essential elements of being human." Thus, none of the options directly reflect the information given for the next decade. However, given the overall tone of concern about long-term impacts, we can infer that many experts anticipate potential negative consequences.

Given the lack of direct information about the next decade, and the emphasis on concerns, the closest option, though not perfectly accurate, would be:

A. AI will make people worse off. (This reflects the general concern, even if the timeframe isn't exact.)

Question 23. The first paragraph explicitly mentions the experts' concerns: "Yet, most experts, regardless of whether they are optimistic or not, expressed concerns about the long-term impact of these new tools on the essential elements of being human." The accompanying table (which isn't provided here, but the text refers to it) likely outlines these threats. Option B aligns with this general concern.

B. AI will threaten human autonomy and capabilities.

Question 24. Paragraph 4 isn't included in the provided text. Therefore, I cannot definitively answer this question.

PART 1: Error Correction

Question 25. The correct idiom is "had better + base form of the verb."

B. learning should be learn.

Question 26. The phrase "that means" should be preceded by a comma because it introduces a non-restrictive clause providing additional information.

B. that should be which. (Alternatively, you could remove 'that' and keep 'means' if you restructure the sentence slightly, but the underlined part as it is needs correction.)

PART 2: Sentence Rewriting

Question 27. "Come on, children! Use your imagination as well as your knowledge!" → The teacher encouraged the children to use their imagination as well as their knowledge.

Question 28. Don't lie in a job interview or you'll get caught out easily. → If you lie in a job interview, you'll get caught out easily.

PART 3: Problem-Solution Essay on Internet Risks for Teenagers

The internet has become an indispensable part of teenagers' lives, offering unparalleled opportunities for learning, socializing, and entertainment. However, this digital landscape is also fraught with risks that can significantly impact their well-being and future. Identifying these dangers and implementing effective solutions is crucial to ensure a safe and positive online experience for adolescents.

One of the most pervasive threats is cyberbullying. The anonymity and reach of the internet can embolden aggressors to harass, humiliate, and threaten their peers relentlessly. This can lead to severe emotional distress, anxiety, and even depression in victims. Another significant risk is exposure to inappropriate content, including pornography, violent extremism, and hate speech. Such exposure can desensitize teenagers, distort their understanding of healthy relationships, and potentially radicalize vulnerable individuals.

Furthermore, the allure of social media often leads to issues related to privacy and self-esteem. Teenagers may unknowingly share excessive personal information, making them vulnerable to identity theft or online predators. The curated and often unrealistic portrayals of life on social media can also foster feelings of inadequacy and contribute to body image issues and a constant need for validation through likes and followers. Online predators also pose a serious threat, using various tactics to groom and exploit young people.

Addressing these risks requires a multi-pronged approach involving education, parental involvement, and technological safeguards. Comprehensive digital literacy programs in schools can equip teenagers with the critical thinking skills to identify online dangers, understand privacy settings, and practice responsible online behavior. Parents need to be actively involved in their children's online lives, fostering open communication, setting clear boundaries regarding internet usage, and monitoring their online activities. Utilizing parental control software and privacy settings on devices and social media platforms can also provide an added layer of protection.

Moreover, social media companies and internet service providers have a responsibility to create safer online environments. This includes implementing stricter content moderation policies, developing effective mechanisms for reporting abuse, and promoting digital well-being initiatives. Raising awareness about online risks through public campaigns and encouraging open dialogue within communities can also contribute to a safer digital world for teenagers. By working collaboratively, educators, parents, technology providers, and teenagers themselves can mitigate the dangers of the internet and harness its potential for good.