Complete the 12 sentences below. Choose the best answer for each one.
#1. If people ______ enough water, they usually feel healthier.
#2. If ice ______ in the sun, it melts very quickly.
#3. If students ______ carefully in class, they understand the lesson better.
#4. If you ______ oil and water together, they do not mix.
#5. If my brother ______ too much coffee at night, he cannot sleep well.
#6. If plants ______ enough sunlight, they grow faster and healthier.
#7. If people ______ regular exercise, they usually have more energy during the day.
#8. If a person ______ too close to the fire, they feel very hot.
#9. If children ______ vegetables every day, they stay healthier.
#10. If you ______ metal in water for a long time, it sometimes rusts.
#11. If the weather ______ cold, many people wear jackets outside.
#12. If we ______ our phones for too many hours, our eyes become tired.
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