下列各组字母中全部是元音字母的是 ____。A. a, e, o, r B. a, i, u, e C. o, u, e, n
They______ when the teacher came in.
How long have you read this book? _________________.
Pop music _________ relaxing.
Let’s__________ and have a rest.
________ you know , Lao She’s Teahouse is a great play.