准确答案如下：
1.Beijing is larger/bigger than any other city in China.
Beijing is larger/bigger than the other cities in China.
Beijing is larger/bigger than any of the other cities in China.
Beijing is bigger/larger than all other cities in China.
2.Beijing is bigger/larger than any city in Singapore.
Beijing is bigger/larger than all the cities in Singapore.
注：北京的确属于中国,不属于新加波范围内.
不过不知道楼主是不是自己生造的句子：貌似新加坡只有一个城市.