Prepositions: identify the correct missing preposition in each sentence to complete the crossword.

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Across
  1. 3. He went hiking _____ his adventurous friends.
  2. 4. Everyone was invited _____ the party, except for John.
  3. 6. The discussion centered _____ the upcoming project.
  4. 7. Beside the roaring river, they set up their campsite for the night..
  5. 10. The decision is still _____ approval.
  6. 13. _____ the rain, they continued with the outdoor event.
  7. 14. His attitude has shifted _____ a more positive outlook on life.
  8. 17. He received a letter _____ his long-lost friend.
  9. 19. The book is _____ the top shelf of the bookcase.
  10. 20. She had many questions _____ the new company policies.
Down
  1. 1. The treasure was hidden _____ the ancient castle.
  2. 2. They have been friends _____ elementary school.
  3. 4. She walked _____ the forest to reach the clearing.
  4. 5. The book is _____ the top shelf of the bookcase.
  5. 8. The event will continue _____ midnight.
  6. 9. He sings _____ a professional opera singer.
  7. 11. Their new house is _____ the city center.
  8. 12. A bridge stood _____ the two banks of the river.
  9. 15. The passengers went _____ the ship for their journey.
  10. 16. She felt comfortable _____ the group of strangers.
  11. 18. The jogger ran _____ the park and toward the beach.