Digraphs 'gh' and 'ph' and the blend 'qu'

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Across
  1. 3. Able to endure hardship or pain.
  2. 4. The action or sound of laughing.
  3. 8. A sentence worded or expressed so as to elicit information.
  4. 12. Having an uneven or irregular surface.
  5. 13. The necessary items for a particular purpose.
  6. 14. As much or as many as required.
  7. 15. A current of cool air in a room or other confined space.
  8. 17. Overcome and take control of.
  9. 18. A set of letters or symbols in a fixed order used to represent the basic set of speech sounds of a language.
Down
  1. 1. Being the same in quantity, size, degree, or value.
  2. 2. Each of four equal or corresponding parts into which something is or can be divided.
  3. 5. The use of diagrams in calculation and design.
  4. 6. An act of asking for information.
  5. 7. An account of someone's life written by someone else.
  6. 9. A picture made using a camera.
  7. 10. The study of the physical features of the earth and its atmosphere.
  8. 11. To make the spontaneous sounds and movements of the face.
  9. 13. A statement that the values of two mathematical expressions are equal (indicated by the sign =).
  10. 15. A combination of two letters representing one sound.
  11. 16. Dividing the earth into northern and southern hemispheres.