Read the following job advertisement and mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks.

2.1. The Greatest Invention Ever Have you ever wondered about a groundbreaking (9)____ that could change the world? This remarkable invention is a combination of technology and creativity, designed (10)______ the most pressing global challenges. The (11)_____ is easy to use and efficient, offering a sustainable solution for clean energy: (12)_____ by a team of engineers, it has already made a significant impact on communities worldwide, transforming how people live and work. With a focus on improving daily life, this invention helps people with saving money on energy bills. When the engineers worked on the project, they ______ innovative ways to improve efficiency. Imagine stepping into a brand-new world and embracing a future powered by innovation and sustainability: