Silent letters

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Across
  1. 3. Tap on a door to get attention (5)
  2. 4. Covers a sweet or chocolate (7)
  3. 5. What you do with a pen or pencil (5)
  4. 7. Peaceful and not worried (4)
  5. 8. When you're not sure about something (5)
  6. 10. One part when something is split in two (4)
Down
  1. 1. A sharp tool for cutting (5)
  2. 2. What you give to a question (6)
  3. 6. Land surrounded by water (6)
  4. 9. The short, thick finger (5)