21.—Are you going to visit him this afternoon?
—Well,____.
A.I don't know B.it depends C.never mind D.it doesn't matter
22.Chinese culture has become ____ interest for people all over the world since the Shanghai Expo and many foreigners are discovering ____ history of China.
A.an; the B.the, 不填 C.an; 不填 D.the; a