题目内容：

阅读下面材料，在空白处填入1个适当的单词或括号内单词的正确形式。

I wonder 1 it is because I haven’t been able to be outdoors for so long that I have grown so crazy about everything to do 2 nature. I can well remember that there was a time when a deep blue sky, the song of the birds, moonlight and flowers could never have kept me spellbound. That has changed 3 I was there. For example, one evening when it was so warm, I stayed awake 4 purpose until half past eleven in order to have a good look at the moon by 5 (I). But as the moon gave far too much light, I didn’t dare open 6 window. Another time five months ago, I happened to be upstairs until the window had to be shut. The dark, 7 (rain) evening, the wind, the thundering clouds held me entirely in 8 (they) power; it was the first time in a year and a half that I 9 (see) the night face to face… Sadly, I am only able to look at nature through dirty curtains __10__ (hang) before very dusty windows.