Now m____ do a lot of heavy work in factories,so people can have more free time.
问题描述：
Now m____ do a lot of heavy work in factories,so people can have more free time.
答
machines 机器（复数）
答
machines 机器
答
应该是：
machines机器
现在机器可以做很多重活,因此人们可以有很多的休息时间