1. If the earth …gets……. (get) warmer, the sea will get warmer.
2. If the sea gets warmer, the ice at the North and South Poles …will melt……. (melt).
3. If the ice at the North and South Poles …melts……. (melt), the sea level will rise.
4. If the sea level rises, there …will be……. (be) floods in many parts of the world.
5. If there …are ……. (be) floods in many parts of the world, many people will lose their homes and land.