Riddles

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Across
  1. 3. What goes up, but never comes back down?
  2. 5. With pointed fangs and in plain sight, my bloodless victims are bound by my bite.
  3. 6. John's dad has 4 sons: March, April, and May. Who is the fourth son?
Down
  1. 1. What begins with an 'e', ends with an 'e', contains one letter, but is not the letter 'e'?
  2. 2. What starts and ends with 'T', and is filled with T?
  3. 4. Where can you finish a book without ever finishing a sentence?