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？

第一题是（地点）定语从句
where.........decade一句修饰developing countries
each是指的cities