Intermediate Riddle

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Across
  1. 1. it can teach you but it is not a teacher
  2. 3. it can walk but it doesn't have legs
  3. 6. sometimes it's shiny, sometimes it's gold; sometimes it lights up the world, but sometimes it doesn't.
  4. 7. it is cold, it is made of metal and plastic, it is used to keep food for a long time
Down
  1. 2. sometimes it's sweet, sometimes it's not sweet; sometimes it's green, sometimes it's orange
  2. 3. it's long and rectangle, it's made of glass and wood, it is for air circulation
  3. 4. it's black, it' used to play games or watch movies, it's made of metal and plastic
  4. 5. sometimes it's long, sometimes it's short; sometimes it's curly, sometimes it's straight, most of the people have it black.
  5. 7. it's made of cement, it's square and it's hard, we step on it