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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