—Look! Mark is reading a book in the library.
—It ________ be him. He is in the classroom.
can’t
wouldn’t
needn’t
-- _________ , Cindy! -- Good afternoon, Grace!
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.