do it or no skb

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Across
  1. 1. something like water, coke, juice
  2. 4. bright, very sudden light
  3. 5. math, history, geography; you learn them at school
  4. 6. like glasses
  5. 10. big boom
  6. 11. it's on the wall, you put books on it
  7. 12. people eat with it
Down
  1. 2. they tell you what to do
  2. 3. like sugar, salt and sand
  3. 7. you put them on your hands when it's cold
  4. 8. we have it every Friday
  5. 9. you wear it before an experiment