1) it's useful to drink a water before you eat
2) do you like listening to a music?
3) in the morning the school is full of a noise
4) could l have bottle of a mineral water?
5) l am a reading an interesting book about Australia
6) Olivia doesn't like a milk in the morning. She prefers juice a tea
7) what kind of an Ice cream would you like: chocolate or vanila?
8) would you like an orange?
артикль "an" ставится когда слово начинается с гласной буквы