听单词，从A、B、C、D中选出一个能填入句子空白处的最佳选项。
1. Mr Smith is a ______ in Shanghai. He visits many places every year.
2. ______ is in the southwest (西南) of China.
3. Look! The children are swimming in the ______.
4. Don't ______ to close the door when you leave.
5. In the ______ we can see lots of different animals.
