(¡¡¡¡)21. —Helen, what can you see in ____ picture?

 —I can see ____ radio in it.

A. a; a                                    B. a; the

C. the; the                                D. the; a

(¡¡¡¡)22. —I can't find my book.

—Haha! It's ____ the desk.

A. under                                   B. in

C. on                                      D. for

(¡¡¡¡)23. Her jacket____hat are on the sofa, ____her clock is not.

A. and; and                                B. but; but

C. but; and                                D. and; but