题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

I love natural science, which came from my curiosity in nature. From 1. early age, I caught frogs and insects in the nearby woods. I explored the cool streams 2. (run) through the woods and searched for fish living in the water.

As I grew up, my interests expanded around subjects in school, particularly3. biology, chemistry and physics in high school. These interests were increased with more time4.(spend) in the deserts of Arizona. The desert was not totally new to me, since I5.(visit) relatives in Phoenix several times before I moved there. However, exploring the desert on my own was new. I checked under every rock and bush looking for 6. (sign) of life. I found many incredible animals. Once I happened to discover 7. (poison) snakes under a rock. I was very sacred. However, I 8. (eventual) grew to be cautious of them and now snakes are my favorite study subject.

I am now an ecologist. I have done research in deserts, forests, streams and lakes. Finding new species still 9.(excite) me. I am glad to have a strong curiosity in the natural world. My hobby and curiosity make me 10. I am now.