Zero and first conditional
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If we ____ (recycle), we ____ (pollute) less.
If we recycle, we will pollute less.
If we _____ (not take care) of our planet, the ice caps ____ (melt).
If we don't take care of our planet, the ice caps will melt.
If water _______ (reach)100ºC, it ________ (boil).
If water reaches 100ºC, it boils.
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