I ____while reading the English textbook ,Luckily ,my roommate woke me up in time怎么翻译

问题描述:

I ____while reading the English textbook ,Luckily ,my roommate woke me up in time怎么翻译

我在阅读英语教科书时-----了,幸运的是,我室友及时将我叫醒了.
横线上填的单词应该是睡着了.slept