Question

Which pair of words in these lines from “Kubla Kahn” does Samuel Taylor Coleridge use to create assonance? “incense” and “bearing” “With” and “walls” “twice” and “miles” “there” and “were”

Answer 1

Assonance refers to the repetition of the same vowel in neighboring words. Having that in mind, the correct answer should be twice and miles. 
As you can see, both of these words have the vowel i which is read as eye in both words. The other options do not have such a repetition of the same vowel which is why they are incorrect.