题目内容：

Earth Day is an event 1. (annual) celebrated on April 22. 2. (found) by Senator Gaylord Nelson, an American politician and environmentalist, it was originally aimed at helping the public to know the current situation of air and water pollution and 3. (get) people to care about the earth.

In 1962, Rachel Carson’s bestselling book “Silent Spring” created an 4. (aware) of the dangerous effects pf pesticides（农药）. Then, a fire, 5. broke out in 1969 on Cleveland’s Guyahoga River, shed light on the problem of chemical pollution in water. Senator Gaylord Nelson dreamed of 6. similar large event that would get people to take environmental issues seriously. In 1969, he was inspired by protests against the Vietnam War and came up with the idea for Earth Day.

In the fall of 1969, Nelson announced it and appealed to the entire country to get involved. Consequently, telegrams, letters and telephone calls 7. all over the country poured in. Since 1970, Earth Day celebration have grown. Later, Nelson 8. (award) the Presidential Medal of Freedom in recognition of his work.

Today, Earth Day is celebrated around the world every April 22. Sometimes numerous communities celebrate Earth Week, an entire week of 9. (Activity) focused on the environmental issues. In 2017, the March for Science 10. (occur) on Earth Day (April 22, 2017) and was followed by the People’s Climate Mobilization (April 29, 2017).