根据对话内容，从下面方框中选择适当的单词或短语填空，使对话内容完整正确，并将答案填写在答题卡标的相应位置上。


A:  Hey! I met a student from a green school in Dalian.
B:  A green school?        is it?
A:  It is a school which supports the protection of the environment. In fact,    there are    green schools in China. It’s wasteful to throw away glass,   paper and metal,     every class in such schools collects waste that can be used again and then sells it for recycling（再利用）。
B:  Great! What else do they do?
A:  They also save energy and tricycle things at home, such as    lights and saving water.
B:  If everyone tries to protect the environment, we will make the world much better.
A:  I agree. If we don’t, the future is     .
B:  Anyway, public concern over the environment has greatly increased. There is hope for the future.