21. —How long are you staying?

—I don't know.________.

A. That's OK¡¡¡¡¡¡      B. Never mind      C. It depends  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. the£»/          B. an£»the         C. an£»/        D. the£»the