Zero or First Conditional

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When water (reach) ……… 100 C°, it (boil) …….

When water reaches 100 C°, it boils.

If the polar ice (melt) …….., sea level (rise) ………… causing floods.

If the polar ice melts, sea level rises causing floods.

Fire (go out) …………… when you (pour) ……….. water on it.

Fire goes out when you pour water on it.

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