More highways have been built in China,_making__ it much easier for people to travel from one place to （another one这我给你随便补充了哈）
译文：更多的高速公路已经在中国建成了,这使得人们从一个地方到另一个地方旅行更方便了.
making以现在分词的形式表示伴随状态,作前面整个句子的状语.
如果是to make ,你带进去看一下：
More highways have been built in China,_making__ it much easier for people to travel from one place to （another one）
译文：更多的高速公路已经在中国建成了,为了使得人们从一个地方到另一个地方旅行更方便.
看出来了吗 后者to make以不定式的形式表示目的,“还没有发生”,与前面“已经建成”在逻辑上矛盾了
如果说是More highways should be built in China,___ it much easier for people to travel from one place to （another one）这里的空缺就要填to make 即：
More highways should be built in China,_to make__ it much easier for people to travel from one place to （another one）
译文：为了使得人们从一个地方到另一个地方旅行更方便,中国应该建造更多的高速公路.
希望对你有所帮助,学习愉快!