根据中英文写出单词的适当形式。

1. On _____ (下雨的) days ,most people don't like to go out.

2. We lost ourselves in the _____ (美丽) of Jiuzhaigou.

3. At 6 months old, Xi wang began to eat bamboo shoots and _____ (叶子).

4. I have _____ (少) money than Millie.

5. I study birds and _____ (变化) in their numbers .