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there is more food and water in space than on earth eating and drinking in space is a special problem astronauts can never eat or drink in a spaceship there is no food or water in a spaceship
to protect; being polluted to protect; polluting to protecting; being polluted to protecting; polluted
to prevent；being polluted to prevent；polluting to preventing；being polluted to preventing；polluted
there is more food and water in space than on earth eating and drinking in space is a special problem astronauts can never eat or drink in a spaceship there is no food or water in a spaceship
April 22 April 22, 1970 April 22, 1990 Sunday, April 22
to protect; being polluted to protecting; being polluted to protect; polluting to protecting; polluted
only on Earth Day do people realize people in the world have begun to realize people in the world are well aware of Europeans are not aware of
Food for astronauts must be made in a special way. All meat on earth comes in bite - size pieces. Astronauts will only eat cakes made from crumbs. Astronauts have to go hungry in a spaceship.
there is more food and water in space than on earth eating and drinking in space is a special problem astronauts can never eat or drink in a spaceship there is no food or water in a spaceship
Food for astronauts must be made in a special way. All meat on earth comes in bite - size pieces. Astronauts will only eat cakes made from crumbs. Astronauts have to go hungry in a spaceship.
to prevent ; being polluted to prevent ; polluting to preventing ; being polluted to preventing ; polluted
to help people memorize the earth to help people to learn how to protect the earth to unite all the people on the earth all of the above
brief special general specific
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