IV. Rewrite the following sentences using the words given 1. Eat better food, and you won’t get sick.  If you 2. Save energy, and you will save some money.  If you 3. Protect the earth or we will have no place to live.  If we 4. Unless you study it, you won’t understand it.  If you 5. If you don’t study harder, you won’t pass the exams.  Unless you 6. Don’t pollute the air, or we will have breathing problems.  If we 7. Keep the water clean, or the fish in this lake will die.  If you 8. Remember to turn off all the lights here, or you will waste lots of electricity.  If you 9. Be patient, or you won’t pass the examination.  If you 10. Plant more trees, or the air will be more polluted.  If we 11. Water these trees or they will die.  If you 12. Leave now or we will miss the plane.  If we 13. Be careful or you may fall.  If you 14. Plant more trees and we will have fresh air.  If we 15. Use reusable bags and we’ll help the environment.  If we 16. People use too much bright lighting in big cities. They have light pollution.  If people 17. Save water or there will be less fresh water to use in the future.  If we 18. Throwing rubbish on the lakes or river makes the water polluted  Throwing rubbish 19. Walk more and you will be healthy.  If you 20. People stop using so much energy. They want to save the environment.  If people