下列字母都是元音字母的是________。
They often watch some English movies to relax _____ after school.
—Do you play _____ piano in your free time?--No, I like sports. I often play _______ chess with my classmates.
--Sit down, please.-- .
--Are there ______ books in the box?--Yes, there are ______.
--What are your ?-- They are workers.