用方框中所给单词的适当形式填空，每词仅用一次(每空一词)。

Anna: What is the topic of your project?

Alice: About in our city.

Anna: It is a good topic.

Alice: The pollution is rather serious. It's said that some pour waste water into the river near our city.

Anna: It may pollute our water.

Alice: You're right. We should do a survey near the river and take action.

Anna: great your idea is!

Alice: I'll write my report and do something for it. Would you love to do it with me?

Anna: Sure! Let's work .

Alice: The city is our home. It is our duty to make it clean and .