Uni, Bi, Tri, and other

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Across
  1. 1. Muscle with 'two' heads that attach to bone
  2. 4. Triangular. Having three sides and three corners
  3. 6. Able to speak two languages fluently
  4. 7. A fork shaped object
  5. 10. All students wearing the same thing
  6. 11. A number with eight-teen zeros
  7. 12. A mythical one-horned creature
Down
  1. 1. A vehicle with two wheels
  2. 2. Very special
  3. 3. When you spit something in two
  4. 4. Test; proof
  5. 5. Information technology
  6. 8. A number with twelve zeros
  7. 9. Consisting of or involving three items or people
  8. 10. Being together at the same time