C

　　Have you ever heard of the story of Earth Day? Now let me tell you.

　　Earth Day was started in 1970 by a man named John McConnell from the United States. In the beginning, it was held on one day in spring when the day and night are of the same length around the world. Now it is celebrated on April 22. Earth Day is now celebrated all over the world.

　　Earth Day is a very special day. It makes all of us think about problems we make for the earth. It is not only a special day in the city where we live, but a day that the whole world celebrates.

　　Some countries have Earth Day celebrations, and some people and groups join in Earth Day projects(計劃) such as “Protect Our Home”, and “Water for life”.

　　You can join in one of the projects, or start one of your own. It can be something small like planting a tree with your mom, or something large like cleaning up a park with your classmates or friends. You can do almost anything. Try to think of something you would like to do.

　　Why do we celebrate Earth Day? Because we have only one earth and it is our only home. It is getting very dirty. It is our duty to protect our beautiful home. Earth Day is a day to call on people around the world to save our earth.

　　66. An _____ called John McConnell started Earth Day in 1970 and now is celebrated all over the world on the ______of April.

　　67. On Earth Day people don’t ______ celebrates this special day also think more about what’s ______ to the earth.

　　68. Some countries have different Earth Day _______by _______ in Earth Day projects.

　　69. It doesn’t ______ ______ your project is small or large.

　　70. We celebrate Earth Day to ______ people around the world to ______our earth.