With the development of economics（經濟），the problem of the left-behind children has become a serious social problem.（1）

B

B

   （2）

A

A

Many of them can just get a call or a letter from their parents half a year，a year of even several years.So some children can't remember what their parents look like.（3）

C

C

Nobody gives them enough care.
   Because of being too far away from their parents，the left-behind children's study becomes the second biggest problem.From a survey about their study，only two percent of the children get good results，while ten percent of them are common and eighty-eight percent of them are poor.（4）

D

D

What a pity!
   There are also many other problems of the left-behind children，such as having no ability to protect themselves，unhealthy lifestyles，spending too much pocket money and too much time on the Internet and so on.（5）

E

E

   In a word，so solve all the problems of the left-behind children needs the government，families and schools to try their best.

A.The biggest problem is that the children are all hungry for the love of their parents.
B.More and more people realize we should do something to help them.
C.When they meet their own troubles，they have no one to talk with.
D.Most of them almost lose their interest in study.
E.In this way，it's easy for them to fall into bad and unhealthy habits.