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 from 19 to 24.

Environmental pollution is a serious global problem that affects everyone. It refers to the introduction of harmful materials (19) _____ the environment. This includes air, water, and land pollution. (20) _____, air pollution from factories and cars can cause respiratory diseases. The improper disposal of plastic waste is a major cause of water pollution in rivers and oceans. To combat this issue, governments are introducing strict laws, and people are encouraged to adopt (21) _____ lifestyles. Recycling waste and using public transportation are two simple actions that can (22) _____ a big difference. (23) _____, education plays a crucial role in raising awareness, especially among young generations. Experts believe that if we work (24) _____, we can save our planet for future generations.