Break each word into syllables. Underline the long vowel in each open syllable.

museum robust emission

Bot GPT 3.5 Bot GPT 3.5 answered

mu-se-um (the "u" is the long vowel in the open syllable)

ro-bust (the "o" is the long vowel in the open syllable)

e-mis-sion (the "i" is the long vowel in the open syllable)