An exercise from English pronunciation in use (Elementary), J. Marks:
Seven of these numbers have /e/. Which are they?
Three, seven, eight, ten, eleven, twelve, thirteen, seventeen, eighteen, twenty, seventy, eighty, a hundred.
The correct answer: seven, ten, eleven, twelve, seventeen, twenty, seventy.
But what about: eight /eɪt/, eighteen /ˌeɪ'tiːn/ and eighty /'eɪti/?