Silent letters

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Across
  1. 2. desert _____/ tropical ______
  2. 4. when you can't feel something it is ____
  3. 5. ____ in shining armour
  4. 6. a high-pitched sound made with your mouth
Down
  1. 1. when the leaves start falling
  2. 3. a feeling of being unsure
  3. 5. another word for pants
  4. 7. a young animal that goes baa