Prepositions – at, in, on – Test

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Task Nr. 3023

Which of the following prepositions at, in or on can be put before the following words or phrases?

  1. earth
  2. the Internet
  3. work
  4. the country
  5. the bus
  6. horseback
  7. the age of 21
  8. home
  9. public
  10. the wall