Ⅵ、补全对话（5小题；每小题2分，共10分）

根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。

A: Environmental problems have become more and more serious.

B: Yes , I think so. Last weekend I planned to swim in Qingcheng River. When I got there, I was shocked by what I saw.61                .But now, it is full of rubbish, and there is no fish at all.

A:62.                ！And the air pollution is serious, too. How I miss the blue sky and the fresh air! 63.                 ?

B: First, we' must take action from ourselves.64.              ．

A: I agree. Being volunteers really helps.

B: Then, we need to invite more people to join us.

A: Good idea! But how can we do that?

B：65.                   ？

A: Sounds good! Let's do that!