Guess The Inventions

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Across
  1. 4. Reminds you to wake up
  2. 5. Math made easy
  3. 6. Two wheels
  4. 8. Call me maybe?
Down
  1. 1. Say cheese!
  2. 2. Bright idea
  3. 3. All aboard!
  4. 4. Up in the air
  5. 7. Tick tock