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