Reall the following passage about humanoid robots and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

In recent years, artificial intelligence (AI) has been widely applied in various fields, including healthcare, finance, and education. AI systems are now ___(1)___. Despite these advancements, there are still concerns about the ethical use of AI, particularly in ___(2)___.
Many organizations are adopting AI technologies ___(3)___. These technologies have the potential to transform industries, but experts emphasize that AI should complement human abilities rather than replace them. For example, in education, AI can ___(4)___, allowing teachers to focus on other important aspects of teaching. However, it remains crucial to ensure that AI ___(5)___.