The alphabet and the letters

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Across
  1. 3. The letters A, E, I, O, U are a what?
  2. 5. How many letters are in the alphabet? (Put number in word form)
  3. 6. What type of letter do you use at the beginning of a sentence or for proper nouns?
  4. 7. The whole alphabet on a keyboard
  5. 8. The opposite of a vowel
Down
  1. 1. Which civilization invented the first alphabet? (Hint: Hieroglyphics)
  2. 2. What is a combination of letters created to shorten words
  3. 4. Groups of letters used in sentences which each have their own meaning
  4. 9. All the letters of a certain language used to create words