21. This apostrophe-like symbol indicates a glottal stop and precedes a separate vowel sound . 22. This version makes use of glottal stops in word endings preceding by vowel sounds . 23. The formants of vowel sounds and their relation are crucial in differentiating vowel sounds . 24. "It's as much built out of vowel sounds as anything," 25. Her voice is warm, her vowel sounds well rounded & What a performance ". 26. Miss Andrews has slowly _ and perfectly _ enunciated a series of vowel sounds . 27. A vowel sound is conventionally added for pronunciation purposes .) 28. Certain particular vowel sounds are the best defining characteristics of regional North American English. 29. Vowel sounds , word families, even silent E remained a mystery.30. The formants of vowel sounds and their relation are crucial in differentiating vowel sounds.
