Subjects

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Across
  1. 2. is used by the most people in the world
  2. 3. can make you understand the maps and customs
  3. 6. is about numbers
  4. 7. is old but interesting
  5. 8. is always used by Chinese
  6. 9. can tell you the rules about how things run
  7. 10. is about how people work
Down
  1. 1. can make you know animals and plants
  2. 4. is about how people cooperate
  3. 5. can tell you the phenomenons about how things change