(¡¡¡¡)21. —I want____T­shirt for my son.

—How about____black T­shirt?

A. a; /                                    B. a; the

C. an; the                                 D. an; /

(¡¡¡¡)22. —____is the blue sweater?

—It's 25 dollars.

A. How much                                B. What 

C. How old                                 D. What color