21．The 16 th Asian Games were held in city of Guangzhou, international city in the south of China.
A．the; an B．a; an C．a; the D．the; the
22．The notice came around two in the afternoon the meeting would be put off.
A．when B．that C．whether D．how
23． an important decision more on emotion than on reason, you will regret it sooner or later.
A．Based B．Basing C．Base D．To base
