If people eat too much, ____ If you touch a fire, ____ ____ if you mix hydrogen and oxygen. ____ they cry. If you heat ice, ____ If it rains, ____ If you freeze water, ____ ____ you get purple. If public transport is effecient, ____ If you heat water to 100°C, ____ If you ____ water for a long time, it boils. We get tired when ____ get enought sleep.

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