Vocabulary unit 9

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Across
  1. 3. Helps the teachers and students in a school.
  2. 5. trash, such as paper, cans, and bottles, th
  3. 7. of two or more people) do something alternately or in succession.
  4. 9. is left lying in an open or public place.
  5. 10. Helps the students cross the street.
Down
  1. 1. people find books and information.
  2. 2. .
  3. 3. behaving in a way that is socially correct
  4. 4. keeps people safe when they swim.
  5. 6. one of a set of red, yellow, and green lights that control the movement of vehicles
  6. 8. make someone or something clean.