Vocabulary Review

1234567891011
Across
  1. 2. A problem with air and water
  2. 4. Smaller than a river
  3. 8. City _______
  4. 9. Thang Long Imperial Citadel
  5. 10. _______ system
  6. 11. Kings and queens
Down
  1. 1. How many years you will live
  2. 3. Impossible to solve
  3. 5. Cars, motorbikes, bicycles, trains, boats....
  4. 6. Son Doong ____
  5. 7. Energy from the sun