1. Describe a place you visited that has been affected by pollution描述一个你去过的被污染的地方；

2. Describe a place you know where people go to listen to music(such as a theatre or a music hall)描述一个你了解人们去听音乐的地方（如剧院或音乐厅）；

3. Describe an interesting public place that you like描述一个你喜欢的公共场所；