改成被动语态1 we call water liquid gold beacuse it is precious2 we
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1 The water liquid is called gold beacuse it is precious
2 Coal is called one of the most important natural because we burn it for heating and producing electricity
3 Oil is used in cars and machines
4 air is need for all living things to stay alive
5 The water is polluted when people throw rubbish into the river
6 A lot of trees are planted to make the country greener by Chinese people every year
7 English and French are spoken in this area,but German isn't spoken here.
8 Football is played all over the world
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