根据下列句子的意思及所给的汉语提示，写出空缺处单词，固定短语或固定搭配的正确形式。

1. There are lots of              (叶子) near the lake.

2. Penguins need a new              (游泳) pool.

3. She is              (感兴趣) in Beijing Opera.

4. My pen pal              (居住在) Australia.

5. I              (去睡觉) at eleven last night.