从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. 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 ; x B . an ; the C. an ; x D. the ; the
22. Bob and Tom have nothing in ______ at all . How can they be good friends ?
A. total B. common C. similar D. particular
23. The 16th Asian Games in Guangzhou from November 12 to November 27，2010．
A．was held B．was holding C．will be held D．will be holding
