If we planted more trees, we ... in a fresh area.

1) live 2) would live 3) will live 4) would have lived

 

If the people walked more, they ... healther

 

1) become 2) wiil become 3) would become

 

If people hadn`t invented machines, the environmental problems ... .

 

1) won`t apper 2)appeared 3)wouldn`t appear 

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