Past and the present

12345678910
Across
  1. 3. you speak this language at home
  2. 5. something that you use chalk to write on
  3. 9. A universal language
  4. 10. a subject with explosions
Down
  1. 1. something that you write on with markers
  2. 2. enlarges pictures to show the whole class
  3. 4. helps you in physics and math
  4. 6. a place that contains books
  5. 7. if you break a rule then you serve this
  6. 8. a subject with a lot of numbers