Every year on April 22nd, more than 190 countries celebrate Earth Day to protect the planet. The first Earth Day started in 1970 in America. Today more than 1 billion people (21) ___ Earth Day activities each year, making it one of the largest movements. By taking part in activities like picking up litter and planting trees, you can help protect nature and the environment. You can also do things like (22) ___green products and practising reduce, reuse and recycle. We can celebrate Earth Day and protect the earth at the same time. Moreover, we should continue doing things to save the earth every day (23) ___ the year.(24) ___, many communities organize events to raise awareness about environmental issues. These activities encourage people to (25) ____their habits and make more sustainable choices.

Question 21: A. participate in    B. participating in              C. participated in                      D. participates in

Question 22: A. buy                  B. buying                             C. bought                                 D. buys

Question 23: A. at                     B. in                                     C. for                                        D. on

Question 24: A. Therefore        B. However                         C. Additionally                       D. Meanwhile

Question 25: A. change             B. changed                          C. changing                             D. to change