阅读短文，根据短文内容回答下面的问题，将答案写在答题卡相应题号后的横线上。

Charter schools in the US operate with public money but without many of the rules that govern traditional public schools. In the United States the rules for charter schools are different from state to state. But in general these schools have greater freedom to decide what and how to teach.

A charter school might have nothing to do with the local public school system. It might be started by teachers, parents, community groups or a profit-making business.

Forty-seven million students go to traditional public schools. And more than a million students go to charter schools.

And now a group of charter schools have formed the Green Charter Schools Network. The idea is to have environment friendly school buildings but also to go further than that.

The schools teach students to give lots of time and attention to the community problems that affect them and the environment. For example, young children grow vegetables in a school garden and learn about healthy eating. Older students help recycle waste from restaurants. And local schools share what they grow in community gardens with people in need.

Jim McGrath is president of the Green Charter Schools Network. He says there are about two hundred “green” charter schools across the United States. And the Green Charter Schools Network holds its first national conference this October in Minnesota. Supporters of green schools say their goal is to let the movement be popular across the country.

1.. Are the rules for charter schools the same in the US?  

2.. How many students go to charter schools? 

3.. What do students in charter schools often do?

4.. Do teachers teach students to protect the environment or to know the Network?  

5.. Why do supporters hope charter schools to be popular across the country?