According to the latest dates,there are 2.5 million countryside children whose parents are works in the city have to live with their relatives in the countryside.
It's said that the children who aren't live with their parents would always feel lonely and unhappy.Moreover they often have difficulty in communicating with other .There is no doubt that they are lack of their parent's love.It have bad influence on the healthy development of both physical and mental of the children left behind.Compared with the same aged children ,they often don't hace the ability that they should have. Therefore, when in danger they may easily get hurt.
From my point of view,parents's love the guarantee of children's healthy development. Thus we should pay more attention to the children left behind,and take measures to help them.

括号里为正确的：

第一段第2行：whose parents are works（working） in the city
第二段第1行：the children who aren't(don't) live with their parents
第3行：in communicating with other(others)
4行：lack of their parent's(parents') love
It have(has) bad influence on
5行：of the children left(leaving) behind that they should have(去掉have)
6行：they often don't hace(have) the ability
第三段第1行：parents's（parents'） love （添加is）the guarantee of children's healthy
2行：to the children left（leaving）behind,
3行：take measures（action） to help them.

因为你的回答比提问要多，是个爱帮助人的人，所以我才帮你。
不对的地方楼下请指正，谢谢。