题目内容：

根据首字母提示，完成下列单词的拼写，使句意通顺。

Every minute , about 261 babies are  b1.in the world. The world's population _g2.faster  and  faster. It has become one of the biggest social p3.today. China has the largest population in the world .There are about  1.3  b4.people in China .China has carried out some policies to c5.the population,and these policies have worked well.