1.  In developing countries,___at least 16 cities are expected to have more than 12 million people____by the end of this decade ,failing to give priority to public transport would be disatrous.
A where;each  B which;/    C that;everyone  D in which ;anyone
为什么选A?各位达人请帮忙解释下
where可以引导主语从句吗？

2. IQ题

Millennium celebrations took place in  4 differernt places. Which one occurred first?
A. PARIS  B. SYDNEY  C. NEW YORK  D. GREAT WALL OF CHINA
答案是B 为什么？

我觉得 where...decade 是地点状语从句 failing to give priority to public transport是充当主语的

还是多谢哈