Use it or loose it

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Across
  1. 2. when you study one plus one
  2. 4. when you jump and run
  3. 5. when you study stars
  4. 6. when you study how to draw
  5. 8. when you speak but not in Russian
Down
  1. 1. when you browse the Internet
  2. 2. when you sing
  3. 3. when you do what your teacher told you to do
  4. 5. studies when you study about trees
  5. 7. time when you don't study