阅读下面短文，在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。

    Nowadays square dancing has been becoming popular. Some public places are usually (crowd) with dancers, especially in the morning and evening.

    We all agree that square dancing is a good way to keep healthy, for the old. , it is money-saving. But it also causes noise (pollute). Many people suffer from the noise by the loud music. The can't work, study sleep well. They feel very angry and some argue with the dancers.

    In my opinion, the dancers should turn the volume while dancing. In addition, our government should build (many) public places for them, such as squares and parks. People can have fun dancing without (disturb) others.