Question

sort the words by their vowel sounds.
clue blue mug cube just
short u
long u

Explanation:

To sort the words by vowel sounds:

• Short "u" sound (as in "cup"): "mug" (pronounced /mʌɡ/), "just" (pronounced /dʒʌst/) have the short "u" sound.
• Long "u" sound (as in "cute"): "clue" (pronounced /kluː/), "blue" (pronounced /bluː/), "cube" (pronounced /kjuːb/) have the long "u" sound (either as /uː/ or /juː/ which is a variant of long "u" in English phonics for young learners).

Answer:

Short u: mug, just
Long u: clue, blue, cube