silent letters

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Across
  1. 1. A piece of land surrounded by water (6)
  2. 4. To hit a door with your knuckles (5)
  3. 6. To mark letters or words on paper with a pen (5)
  4. 7. The short, thick finger on the side of your hand (5)
  5. 10. A paper or plastic cover for food (7)
Down
  1. 2. Something said or written to react to a question (6)
  2. 3. A feeling of not being sure about something (5)
  3. 5. A tool with a blade used for cutting (5)
  4. 8. One of two equal parts of a whole (4)
  5. 9. Peaceful, quiet and not worried (4)