... FOR UNIT 4 I. 1. on 2. world 3. them 4. growth 5. food 6. but7. fry 8. desert 9. it 10. kill 11. polluted 12. over13. trees 14. becomes 15. future 16. conserve/ saveII. 1B 2C 3D 4C 5A 6A 7B ... PopulationMost problems of the environment come from population (4) … . In 1990 there were 1.6billion, in 1950, 2,5 billion, 4, 4 billion. In the year 2000 there will be 6.3 billion. Morepeople ... intriguing 8. similar9. arise 10. supportVII. 1B 2A 3A 4A 5B 6B 7B 8A 9A 10BVIII. 1C 2D 3B 4C 5C 6D 7B 8DIX. 1. criminal 2. managing 3. unsuccessful 4. perfect5. appointment 6. surprisingly 7. unfriendly...