21.—Mum, where did you put my new MP3?
—I put it in ________ yellow box under your desk.
A. a B. an C. the D. 不填
22. —Whose book is this? Is this yours?
— No, it’s ________.
A. her B. she C. my D. hers
23. You have just read this newspaper. Did you find_______ in it?
A. interesting anything
B. anything interesting
C. interesting something
D. something interesting