Two vowels go walking

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Across
  1. 2. you ____ books
  2. 3. the mouth of a bird is called a
  3. 4. you hammer a ____ into a wall
  4. 6. the cloth on ships that catches wind is called a ____
Down
  1. 1. 7 days in a ____
  2. 3. you travel on water using
  3. 5. When a bucket is broken it has a ____