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

    In 1962, Rachel Carson's bestseller “Silent Spring” created an ____ (aware) of the dangerous effects of pesticides(农药）. Then, a fire,____broke out in 1969 on Cleveland's Guyahoga River, revealed the problem of chemical pollution in water. Senator Gaylord Nelson dreamed of____similar 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 ____ all over the country poured in. Since 1970, Earth Day celebrations have grown. Later, Nelson____(award) the Presidential Medal of Freedom because of his work.

    Today, numerous communities celebrate Earth Week, an entire week of____(activity) focused on the environmental issues. In 2017, the March for Science ____(occur) on Earth Day and was followed by the People's Climate Mobilization on April 29.