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may have thought can have thought may think might think
environmental engineers designed an object for cars removing harmful pollution the cars are very small the cars don’t use gasoline any longer
Smoke from our homes. Smoke from buses. Smoke from trucks.
to grow to produce fruits to breathe
the moon is 240 kilometer far away we don't know where it is it can't fly without air there is no air on the moon
Nowhere The city The countryside
They thought highly of it and accepted it at once. They just accepted it at once without any hesitation. They just thought it a joke. They thought it was too artificial and took a long time to accept.
may have thought can have thought may think might think
the moon is 240 kilometer far away we don't know where it is it can't fly without air there is no air on the moon
design new kind of cars, buses and trucks that will not pollute the air protect the environment produce cars that will not pollute the air
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