What color is it? ---It’s ________ orange. A. an B. a C. /
别人帮助了你,你应该说“________”
不明飞行物的英语缩略形式是_________.
--Are _______ your quilts, Mary? --No, ______ aren’t.
I ______ a girl. Lucy and Lily _______ my cousins.
--Is _______ your photo? --Yes, it _______.