He thanked us_______ having contributed to cleaning the surrounding environment.

a. However, after volunteering at a local clinic, I discovered a profound passion for community healthcare that I couldn't ignore.
b. Choosing a career path was initially a struggle as I felt pressured to follow in my parents' footsteps into law.
c. This experience taught me that true professional fulfillment comes from aligning your work with your personal values rather than external expectations.
d. Instead of enrolling in legal studies, I decided to pursue a degree in Public Health to make a direct impact on people's lives.
e. Finally, I landed my dream role as a health coordinator, where every challenge I face feels rewarding.

Dear Students and Faculty Members,
a. We are writing to invite all members of our school community to participate in the upcoming "Green Earth" gala aimed at protecting local biodiversity.
b. Please register via the school portal by this Friday if you wish to volunteer for the event or contribute to the fundraising auction.
c. For further information regarding the detailed workshop schedule, feel free to contact the Biology Department office.
d. This initiative is more urgent than ever, as the recent decline in native species has reached a critical point for our local ecosystems.
e. In addition to raising funds, the event will feature several keynote speeches from leading conservationists in the field.
Warm regards,
The Biology Department

Question 21. (Question text and options not supplied in provided pages; solution indicates a paragraph about a multicultural environment with sentences a–e arranged as c - a - e - d - b.)

Question 22. (Question text not supplied in provided pages; solution indicates a gap-fill in a passage on environmental conservation: “... maintains vital ecosystem services like clean air, water, and fertile soil, ______.”)

Question 23. (Question text not supplied in provided pages; solution indicates a gap-fill: “... carbon sinks, which absorb CO₂, regulate global temperatures, and whose effectiveness ______.”)

Question 24. (Question text not supplied in provided pages.)