Разделите слова на 2 группы с долгим [ju: ] и кратким [^] : music, butter, sun, bus, dutch, united, gun, avenue, umbrella, menue, new, hurry, uncle, unhappy, dune

[ju:]: music, avenue, menue,new, dune, united.
[ʌ]: butter, sun, bus, Dutch, gun, umbrella, hurry.

Music ['mjuːzɪk]
butter ['bʌtə]
sun [sʌn]
bus [bʌs]
Dutch [dʌtʃ]
united ['ju'naɪtɪd]
gun [gʌn]
avenue ['ævɪnjuː] 
umbrella [ʌm'brelə]
menu ['menjuː]
new [njuː]
hurry ['hʌrɪ]
uncle ['ʌŋkl]
unhappy [ʌn'hæpɪ]
dune [djuːn]