—What’s on the floor?— A. That’s my key. B. There’s a book. C. It’s red. D Yes , it is .
My mother’s sister is my ________.
—What color is your bike? —___________.
—How is your mother? —_____________.
This is ______ English book, and ______ book is very good.
下列字母中全部是元音字母的是__________.