Nowadays in United States, more and more people are
beginning to build underground houses where save open land.
When houses are underground, there are more land for parks,
playgrounds and gardens. Underground house also save energy.
They use only a few energy to stay warm or cool. As we know,
the idea underground houses is very old. People in the past
live in underground houses and underground cities in China. And
today you can"t find large underground shopping centers in China,
Japan, South Korea and Canada as well as. Some countries also
build underground factories and shop-houses to held things. | 1. _____
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