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Across
  1. 7. (v.) to make a place or substance less pure or make it poisonous
  2. 8. (n.) the act of cutting down or burning all the trees in an area
  3. 9. (adj.) thinking about a person or thing too much or all the time
  4. 12. (v.) to treat a waste substance so that it can be used again
  5. 14. (n.) an action that is taken in order to make someone suffer because he/she has done something wrong
  6. 17. (adj.) involving risk or danger, especially to someone's health or safety
  7. 18. (n.) the use of energy, food or materials; or the amount that people use
  8. 20. (n.) the uncomfortable feeling in a social situation
  9. 24. (n.) a feeling of being annoyed
  10. 28. (n.) a feeling of worry and nervousness about something
  11. 32. (n.) the practise of training students to obey rules and control their behaviour, and punishing them if they do not
  12. 33. (n.) the process of making air, water, soil, etc. dirty
  13. 34. (n.) an official document stating that you have completed a course of study or passed an examination
  14. 37. (n.) a feeling of sadness because something is not as good as you expected, or has not happened in the way you hoped
  15. 39. (n.) the red spots appear on the face and neck
  16. 41. (n.) an argument or a disagreement between people
  17. 42. (v.) to study something you have already learnt to prepare for an examination or a test
  18. 43. (n.) the way in which plants, animals, and people are related to each other and to their environment
  19. 45. (adj.) able to decay naturally and in the way that is not harmful
  20. 48. (n.) an excessive pride in yourself, especially in your own appearance, abilities or achievements
  21. 49. (n.) a substance that causes death or serious illness if it is swallowed or absorbed into the body
  22. 51. (n.) a chemical substance used to kill insects and small animals that destroy crops
  23. 53. (n.) a mark on a school record showing that a student has done something wrong or behaved badly at school
  24. 55. (n.) a punishment of being kept at school for a time after classes have ended
  25. 59. (n.) the state of feeling very sad and without hope
  26. 62. (n.) the activity of using messages on social networking sites, emails, etc. to frighten or upset someone
  27. 65. (n.) the pressure and worry caused by problems in your life
  28. 66. (n.) a person who has completed the school studies
  29. 68. (n.) a form of air pollution that looks like a mixture of smoke and fog, caused by smoke from cars and factories in cities
  30. 73. (n.) the way that you behave towards someone or something that show how you think and feel
  31. 74. (n.) a feeling of sadness, guilt and embarrassment caused by doing something wrong or stupid
  32. 75. (n.) the feeling of sadness because you have no friends
  33. 76. (adj.) able to continue for a long time without causing damage to the environment
  34. 77. (n.) the process of teaching, training and learning in a school to improve knowledge and develop skills
  35. 78. (adj.) wearing clothes that are in fashion
  36. 80. (n.) the process of making somewhere, e.g., parks and other areas, greener with trees and plants in a city
  37. 81. (v.) to make a piece of land that is naturally too wet or too dry suitable for farming or building
  38. 82. (n.) the act of using something until it is completely finished
Down
  1. 1. (n.) the period of becoming sexually mature
  2. 2. (n.) the burning of things until they are completely destroyed
  3. 3. (n.) an official record that shows the courses a student has taken and the marks he/she has achieved
  4. 4. (n.) actions which hurt others physically
  5. 5. (adj.) able to be recycled
  6. 6. (n.) a substance that pollutes something, especially air and water
  7. 10. (adj.) connected with the way plants and living creatures are related to each other and to their environment
  8. 11. (adj.) able to be used again
  9. 13. (n.) a failure to understand someone correctly
  10. 15. (n.) a substance that makes something dirty
  11. 16. (n.) a situation when people spend more money than they should
  12. 19. (v.) to put a type of animal, bird or plant back into a region where it once lived
  13. 21. (n.) an amount of money that is given by a school or an organisation to help pay for the studies of a person
  14. 22. (adj.) made to be used once and thrown away
  15. 23. (n.) the process of taking too many fish from the sea, a river, etc. that the number of fish in it becomes very low
  16. 25. (n.) the state of being extremely fat
  17. 26. (adj.) not using artificial chemicals in the growing of plants and animals for food or other products
  18. 27. (n.) a student's behaviour in school
  19. 29. (n.) the way that someone looks to other people
  20. 30. (v.) to change a substance back to a harmless natural state by bacteria
  21. 31. (n.) a natural ability to influence and interest other people and make them admire you
  22. 35. (n.) used water and waste substances produced by human bodies, that are carried away from houses and factories through pipes under the ground
  23. 36. (n.) the practice of treating people differently in an unfair way
  24. 38. (adj.) with too many people living in a country or a city
  25. 40. (n.) a mark on a school record showing that a student has done something well and is deserving praise
  26. 44. (v.) to use energy, water, etc. as little as possible so that it lasts a long time
  27. 46. (n.) knowing that something exists and is important
  28. 47. (n.) the state of feeling bored
  29. 50. (v.) to use something, especially fuel, energy or natural materials
  30. 52. (adj.) not behaving in a way which is as calm and wise as people expect from someone of your age
  31. 54. (n.) the fact or process of becoming worse
  32. 56. (adj.) harmful to other people, or to society as a whole
  33. 57. (adj.) made dirty, polluted or poisonous by the addition of a harmful substance, chemical waste
  34. 58. (v.) to laugh at someone in order to have fun or embarrass him/her
  35. 60. (n.) all the animals and plants in an area, and the way they affect each other and the environment
  36. 61. (n.) a situation in which a plant, an animal, a way of life, etc. stop existing
  37. 63. (n.) the existence of a large number of different kinds of animals and plants which make a balanced environment
  38. 64. (n.) food that remains at the end of a meal after you have finished eating
  39. 67. (n.) the planting of new trees in an area where there used to be a forest
  40. 69. (n.) the opposition to authority or the unwillingness to obey rules or accept normal standards of behaviour
  41. 70. (n.) a form of energy that is carried by wires, cables, etc., and is used to provide light, heat or power to make machines work
  42. 71. (adj.) describing someone who is not in place because of illness, etc.
  43. 72. (adj.) to describe something that is likely to stay in good condition for a long time without breaking or getting weaker, even if used a lot
  44. 79. (n.) smoke or gas that is unpleasant to breathe in