Fill in the blank:

 Vowels are the sounds in the production of which none of the articulators come very close together so the passage of air-stream is relatively ……… and the error can get out freely

According to tongue height, there are ………..

• A. Open vowels, Low vowels, Mid vowels

• B. High vowels, Front vowels, Mid vowels

• C. High vowels, Low vowels, Mid vowels

• D. High vowels, Low vowels, Central vowels

……… is a vowel sound pronounced as a single, unchanging sound, without any significant change in quality or length.

• A monophthong

• A diphthong

• A triphthong

• A vowel

All vowels are ……… sounds.

Monophthongs are also divided into long and ……..

According to the degree of lip rounding, there are Rounded vowels, Unrounded vowels (spread vowels) and ……………

/ i: / : front, high, ……..,  unrounded, long.

Long monophthongs are vowels with long pronunciation. There are 5 long vowels:

• 1. /a:/, /u:/, /i:/, /3:/, /ɔ:/

• 1. /a:/, /u:/, /i:/, /ɔ:/, /æ/

• /a:/, /u /, /i:/, /3:/, /ɔ:/

• 1. /e /, /u:/, /i:/, /3:/, /ɔ:/

According to the vertical distance between the tongue and the roof of the mouth, there are .......

• 1. Neutral , Neutral , Neutral vowels

• 1. Long and short vowels

• 1. Mid, Low ,High vowels

• 1. Close, Half-open, Half-close, Open

/e/: ……., mid, half-open, unrounded, short.