阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。
I wonder ____ it is because I haven't been able to be outdoors for so long ____ I have grown so crazy about everything to do with nature. I can well remember that there was a time ____ a deep blue sky, the song of the birds, moonlight and flowers could never have kept ____(myself) spellbound. That ____(change) since I was there. For example, one evening when it was so warm, I stayed awake ____ purpose until half past eleven in order ____(have) a good look at the moon by myself. But as the moon gave for too much light, I didn't dare open a window. Another time five months ago, I happened to be upstairs until the window had to ____(shut). The dark, rainy evening, the wind, the thundering clouds held me ____(entire) in their power; it was the first time in a year and a half that I ____(see) the night face to face.
